Last month we looked at Twitter’s numbers for user registrations and total tweets for the month of September. We saw a small decline in new user registrations, but tweeting appeared to be on the rise again following the previous month in which tweeting declined.

The numbers for October follow a similar trend. The information was supplied by Matthew Daines, the lead developer of the Twitter app, Twellow.

According to AdMob, which claims it is the world’s largest mobile advertising platform, mobile web and application use has doubled over the past two years. In September, the firm received over 100 million ad requests from 14 countries, and over 10 million ad requests from 64 countries.

AdMob released its Mobile Metrics report for September, which highlights the rapid growth in usage of mobile web sites and apps on new devices in the past year.

iCrossing has shared the findings from its Enterprise Natural Search Share Index. This is a look at natural search traffic to enterprise level sites, based on a large sample of Fortune 1000 companies across all major verticals.

Microsoft reported its quarterly earnings today with a 14% decline in revenue from the same period a year ago. The company reported revenue of $12.92 billion for the quarter.

Operating income, net income and diluted earnings per share for the quarter were $4.48 billion, $3.57 billion and $0.40 per share, which represented declines of 25%, 18% and 17%, respectively, when compared with the same period last year.

Eyeblaster released its Research Global Benchmark report for 2009, which provides an analysis of the performance of different types of display ads like banners and rich media ads. The research found that while clickthrough rates for standard banners improved with an increase in size, size did not factor into the performance of clicks on rich media ads.

"In rich media, size is only one component of banner visibility on the site," says Eyeblaster.

MAGNA released its US Media Advertising Revenue Forecast today, and reports that although the economy continues to face challenges, expectations for the future have improved significantly during the past two quarters.

The AT Internet Institute conducted a study comparing investments in online marketing campaigns among France, Germany, Spain, and the United Kingdom. The firm’s findings are that the UK far exceeds the other three countries in this realm.

SearchIgnite has released a report, which indicates that paid search spending in the United States was flat year-over-year in the third quarter, yet up 10% quarter-over-quarter. This comes largely from multi-channel retailers, who increased paid search spend by 40% in the quarter, according to the firm. This is despite flat conversion rates and average order value.

Ebates, a site that many big-name brands offer rebates and coupons through, released its online retail report for August, finding that online sales through the site grew 57% during the month, compared to the same time period a year ago.

The categories that showed the biggest growth were: department stores, baby % kids, books & magazines, apparel & shoes, and health & beauty. In fact, only one category covered by Ebates showed decline – home décor.

Spam is rising as we get closer to the Christmas holiday season according to Symantec, although they do say that phishing is down. The company has shared some findings from its September State of Phishing report.

According to the report, there was a 45% reduction in phishing attacks between July and August. Symantec says this will likely be a short-term lull, however, reflecting the end of a particular toolkit attack on social networking sites.

New findings from AdMob indicate that twice as many paid apps are downloaded per user on Apple App Store compared to the Android Market. This information comes from AdMob’s Metrics Report for the month of July.

Nielsen recently shared some findings from its report (pdf) on how teens use media. Interestingly enough, the results don’t live up to the stereotypical "teens are always texting" scenario.

Google’s DoubleClick is presenting findings from a new study it commissioned with Dynamic Logic,  this afternoon at the ARF Conference. The study, titled, "The Brand Value of Rich Media and Video Ads (pdf)," analyzes image (gif/jpg), simple Flash, and rich media (with and without video) ad formats.

New research suggests that email marketing in the US will reach $2 billion by 2014. This isn’t exactly in line with research from JupiterRearch earlier this year, which suggested $2.1 billion in 2012, but it’s looking good for the industry nonetheless.

Research reported by StatCounter says that Microsoft’s new Bing search engine has taken over Yahoo for the second place slot in search market share. Clearly, it’s getting a lot of attention since it just launched, so let’s keep this in context.

Research from Forrester indicates that the US Web Analytics Market is on track to reach nearly a billion dollars by 2014. Forrester attributes this to a need for marketing organizations to be more accountable to businesses.

Also at play is a shift in marketing budgets’ allocation for interactive channels, for the purpose of matching consumers’ migration online, the firm notes. The market is expected to grow to $953 million by 2014, which would be a 17% compound annual growth rate.

What do you get when you cross a video-game with social networking? Virtual worlds – and they’re no joke, particularly with younger generations who are immersing themselves in increasing numbers.

Yahoo Research released an interesting report this month characterizing individual communication patterns. The report is based upon a study that looked specifically at what times of the day people regularly communicated through email, and found that demographics can be pulled away from this information.

Author and WebProNews Blog Partner Michael Stelzner, has put together an interesting report based on a survey of 900 marketers. The report looks at the state of social media marketing. Interesting stats from the report include:

Mobile advertising platform AdMob has released its Mobile Metrics Report looking at statistics for the month of March. It highlights some interesting trends in smartphone applications.

AdMob serves ads for over 6,000 web sites and 1,000 apps and stores and analyzes the data from each ad request, impression, and click. The report is intended to provide insight into trends in the mobile ecosystem.

Research shows that marketers are spending more on online advertising and less on ads in newspapers, magazines, and radio. According to eMarketer, each year, ad spending on online media is growing by at least a percentage point.

eMarketer also projects that online ad dollars will jump about 5% by 2013. Here’s how they see it playing out: