Shareaholic has put out the latest edition of its quarterly Social Media Traffic Report. Its data shows that among Facebook, Pinterest, Twitter, Stumbleupon, Reddit, YouTube, LinkedIn and Google+, Facebook, StumbleUpon and Pinterest saw the strongest gains in terms of referrals.

“These were the only social platforms to have seen their share of overall visits grow substantially,” says Shareaholic’s Danny Wong. “Facebook’s share grew 48.85% (up 5.07 percentage points), Pinterest’s share grew 30.06% (up 1.11 percentage points) and StumbleUpon’s share grew 54.36% (up 0.30 percentage points). Facebook holds the top spot in the social referrals rankings. Last month, this behemoth of a social network drove more than twice the referrals all 7 of the other social media platforms sent to sites, combined.”

There’s no surprise that Facebook and Pinterest are driving strong referrals, with the former being the world’s largest social network and the latter frequently being talked up these days a major driver of web traffic. Some, however, may be surprised to see such a strong showing from StumbleUpon, which rarely makes headlines by comparison.

The fact is StumbleUpon has always been a tremendous driver of traffic to websites putting out the kind of content that StumbleUpon likes, which is pretty much the same content that tends to be shared more on other social networks.

Other notable findings from the report are that Twitter’s share was relatively flat, while reddit and YouTube saw significant drops. LinkedIn and Google+ are at the bottom.

It could be interesting to see how Facebook referrals look over this current quarter following recent changes to the News Feed ranking algorithm.

StumbleUpon was pretty quiet through most of 2013, but announced in September that it had become profitable, sharing its revenue numbers for the first time. Since then, the company has made its first-ever acquisition with the purchase of video discovery service 5by (which just released new mobile apps).

Image via Shareaholic