Even before the acquisition was officially announced this morning, on onslaught of users importing Tumblr blogs to WordPress already began. That is, at least, according to WordPress Founder Matt Mullenweg.

He writes, “Imports have actually spiked on the rumors even though it’s Sunday: normally we import 400-600 posts an hour from Tumblr, last hour it was over 72,000.”

Despite what would appear to be a mass exodus of users leaving Tumblr for WordPress, Mullenweg appears to think that’s not the case. After he initially wrote the post, he updated it to say, “Some people are reading too much into the import numbers — I don’t think there will be an exodus from Tumblr.”

He then pointed readers to the comments on this post, where he said, “I don’t think there will be any sort of exodus from Tumblr. For most folks habits overcome internet-outrage. Even if a million people left, that’s just about a week’s worth of signups.”

Even still, other blogging platforms are likely to get a little bump out of this.

According to a recent report from Pingdom, WordPress’ share of the world’s top blogs has already been on the rise.

If you are unfamiliar with Tumblr, know this: there is a lot of porn on Tumblr – artsy nude content, straight up porn, pretty much all colors of the NSFW rainbow. It makes up a significant part of the Tumblr landscape, and without it, Tumblr wouldn’t really be Tumblr. Some Tumblr users are concerned that Yahoo will waltz in and attempt to change all of that. Before the acquisition went official, some analysts worried that Tumblr’s NSFW underbelly would be an issue for the folks at Yahoo who were considering the deal.

But it wasn’t. Now that the acquisition is official, it’s looking like Yahoo is committed to keeping Tumblr running as is, and that the porn problem, well, isn’t really a problem. During her conference call to discuss the deal, Mayer had this to say when asked about all of the “not-brand-safe” content out there on Tumblr.

“The width and breadth of content on Tumblr is what’s exciting and has allowed it to reach more users.”

And when it comes to possible concerns from advertisers? Well, Mayer noted that Yahoo will just have to have good targeting. Mayer said that Yahoo is going to put more ads inside the Tumblr feed, so we know it’s coming. But Yahoo can pick and choose where they throw those ads, and can steer clear of any content that may concern potential clients.

“We promise not to screw it up. Tumblr is incredibly special and has a great thing going. We will operate Tumblr independently. David Karp will remain CEO. The product roadmap, their team, their wit and irreverence will all remain the same as will their mission to empower creators to make their best work and get it in front of the audience they deserve. Yahoo! will help Tumblr get even better, faster,” said Mayer in her announcement.

And in his, Tumblr CEO David Karp said that “before touching on how awesome this is, let me try to allay any concerns: We’re not turning purple. Our headquarters isn’t moving. Our team isn’t changing. Our roadmap isn’t changing. And our mission – to empower creators to make their best work and get it in front of the audience they deserve – certainly isn’t changing.”

That sounds like Yahoo is going to adopt a fairly hands-off approach to the Tumblr, and that’s good news for Tumblr users. Sure, people lie and things change, but as of right now it appears that Yahoo isn’t that concerned about all of those naughty parts on Tumblr. Carry on.

According to the firm, 52% of these blogs are using WordPress, up from 48% a year ago.

To come up with the top blogs, Pingdom looked to Technorati, which is famous for its annual State of the Blogosphere report, which has transformed into the “Digital Influence Report“. It’s worth noting that Pingdom was only able to identify the platform in use by 94 out of 100 sites.

As you can see, the next largest piece of the pie comes from custom systems, followed by Drupal, N/A, Gawker, BlogSmith, Movable Type, TypePad, Blogger, Ceros, Joomla, and Tumblr.

Considering Tumblr’s rising popularity in recent months, it’s interesting to see it carry such a small percentage here (1 site).

TypePad has increased from two sites to four sites, while Movable Type decreased from seven to four. Drupal dropped by one site. Google’s Blogger gained one site, reaching three.

Here’s the list of blogs, and which platform each uses:

The new ad push marks a first for Tumblr – putting sponsored content in the same context as regular posts. First reported by AdAge, users will now see as many as four of the new ads per day. You’ll be able to tell the difference between the ads and the normal posts by a dollar sign that accompanies the sponsored content.

You may recall that this dollar sign is the same way that Tumblr identified its current ads – the decidedly less-intrusive “Radar” ads that Tumblr debuted in May of last year. These ads appear on the “Spotlight” page, which highlights editor-selected blogs, as well as the Radar, which is seen on the sidebar of Tumblr pages. Back in May, the starting bid for these “Radar” ads was reported to be around $25,000.

“This mobile advertising opportunity is native to how our consumers experience content on our apps; as a continuous stream,” said Tumblr sale head Lee Brown in a statement.

Tumblr is launching the new ads with a handful of high-profile partners, including ABC Entertainment and ABC Family, GE, Pepsi, and Warner Bros. You can expect to see heavy promotion from Warner Bros, who will be serving up ads for upcoming films to the Tumblr mobile community.

This is a mobile-only push, but only for now. Tumblr confirmed to AdAge that these new types of in-stream ads will eventually pop up on the desktop version of Tumblr, but they were unwilling to give a specific date.

Tumblr recently announced that they had crossed the 100 million blogs milestone. As of now, there are over 48.6 billion posts on the site.

Today, Google made the announcement, but it’s only for Blogger blogs, at least at this point. The feature can be enabled from the Blogger dashboard.

“Now when you’re browsing your blog’s comment threads, you’ll see activity from direct visitors, and from people talking about your content on Google+,” says Google Principal Engineer Yonatan Zunger . “For example, if there’s a public Google+ discussion about one of your blog entries, those comments and replies will also appear on your Blogger blog. This way you can engage with more of your readers, all in one place.”

“Your blog readers will now have the option to comment publicly, or privately to their circles on Google+,” adds Zunger. “And when they’re browsing blog comments, they can view all of them, just the top ones, or only those from the people in their circles.”

Everyone will, of course, only see the comments they have permission to see.

Facebook has had a similar offering for quite some time, and it’s a bit surprising that it’s taken Google this long to offer something, and still only for Blogger.

You can see the feature in action here.

In a post on the Blogger Buzz blog, Google software engineers Samantha Schaffer and Renee Kwang walk you through the steps for moving the date of a blog post from above the post title to underneath it, as an example.

“Finally, we’ve added a ‘format template’ button that automatically cleans up the indentation of the template, and made it possible to search for text by pressing ‘Ctrl+F’ once you’ve clicked into the editor,” they write. “To find and replace text occurrences one by one, use ‘Ctrl+Shift+F’ or to find and replace all occurrences at once, use ‘Ctrl+Shift+R’.”

According to the engineers, this project was conceived as part of Google Australia’s BOLD Diversity Internship Program.

Tumblr currently has 100.1 million individual blogs, which are responsible for 44.6 billion posts.

The Next Web first noticed that the ticker had crossed the 100 million mark.

Tumblr, which was founded in 2007, hit 50 million blogs about a year ago. At the beginning of March, Tumblr reported 93 million blogs. That means that Tumblr has added around 7 million blogs in less than a month. That’s some serious growth.

If you want to get a sense on how post blog posts are rolling in on a daily basis, Tumblr reports that there have been over 80 million post today alone.

In the last few months, Tumblr has launched a new native iOS app, and has added tablet support for both Android and iOS.

Tumblr also broke into the top ten sites in the U.S. rankings, although they currently sit at #14 in terms of Quantcast data.

Tumblr is growing like a weed – even topping Facebook in a recent usage survey of teens. Here’s to another 100 million blogs, guys.

“Free travel blogs are the perfect way for you to seamlessly capture all of your memories from your journeys and share your adventures with friends and family,” says MapQuest’s Anke Corbin. “It’s easy to set-up and add photos, stories and more, making it possible for everyone to create their very own travel blog!”

The offering, of course, includes features to let you share your stuff on social networks or with automatic email updates. The iOS app features offline access.

Additionally, you can read journals from other people, which might be just as helpful while you’re traveling as keeping your own. There are privacy settings that allow you to share with only who you want to.

“Travel Blogs is not just a tool to help users document their recent day trip up the coast or two week cross-country excursion,” says AOL’s Brian McMahon. “As part of our library of over 24,000 blogs from Everlater, now part of the MapQuest family, our goal is to help give people valuable and authentic stories that inspire them to set out on their own adventure.”

No word on a possible Android launch.

Today, Quora made a pair of announcements, including the launch of new blogs, and that of a rich text editor.

Like its Q&A, blog posts will be categorized by relevant topics (there are over 300,000 of them). These topics are, of course, followed by users, so these people will have a chance to read your blog posts.

“This is different than other platforms where your audience is dependent on how many people follow you personally,” says Quora’s Kah Keng Tay. “In addition, because of the way that Quora works (i.e., feed, search, the topic system, other distribution channels), your old posts and answers remain discoverable and re-discoverable as Quora’s audience grows.”

More on the blogs here.

The new rich-text editor is for the iPhone as part of a new update the company is launching. More on that here.

Quora says its active writers average 30,000+ monthly views and 350,000+ estimated annual views. Its most active writers average 90,000+ monthly views and 1+ million estimated annual views.

TechCrunch reported on the finding after receiving a tip. As we’ve confirmed separately, if you try to sign up for a new account, you’re greeted with the following message:

Oh noes! Something went wrong.

There was an error loading the page you requested. Please try again later, or send us an email
at help@posterous.com.

According to TechCrunch’s source, this has been going on for over a week. Here’s what Twitter and Posterous said when they announced the acquisition:

Posterous Spaces will remain up and running without disruption. We’ll give users ample notice if we make any changes to the service. For users who would like to back up their content or move to another service, we’ll share clear instructions for doing so in the coming weeks.

To our knowledge, no notice has been giving of any changes, and as TechCrunch notes, the Posterous URL-shortening service Post.ly is still up and running.

We’ve reached out to Twitter for comment, and will update accordingly.