Pinterest drove 3.68% of traffic to publishers in September, the second highest of the social networks on the list and three times as much as Twitter, which ranked third. In fact, Pinterest’s share of overall visits increased by 66% year-over-year, more than any other social network. Pinterest now drives more traffic to publishers than Twitter, LinkedIn, Reddit and Google+ combined.

While most of the social networks tracked in the study showed significant year-over-year gains in referring traffic to publishers, referral traffic from Reddit and StumbleUpon declined 35% and 27.5%, respectively. Google+ remained essentially stagnant year-over-year and continues to refer the least traffic to publishers of the major social networks included in the study.