Facebook Drives 20x As Much Traffic As Twitter Does
Twitter's role as a traffic source pales when compared to its larger rival Facebook. The share of traffic driven by Twitter referrals has fluctuated around 1% for the past year and does not make any signs of changing in either direction. Aside from the obvious difference in size, Shareaholic attributes Twitter's comparably minor role in traffic generation to a couple of reasons: one being the assumption that the Twitter feed is less personal than Facebook's news feed is, and that links posted in Tweets are therefore less relevant to users. Another one being the idea that brands tend to use Twitter as a brand building tool, rather than a means for traffic acquisition.

Description
This chart shows the percentage of overall traffic to websites coming from Facebook or Twitter referrals. Next to social referrals, overall traffic includes direct traffic, paid and organic search traffic etc.