Twitter exposure drives site visitation

"Three key findings on site visitation and Tweet exposure
Twitter users who see Tweets from mobile/tech brands are more likely to visit brand websites.
Twitter users who see mobile/tech brand Tweets are more likely to search for brand websites online.
Twitter users who see mobile/tech brand Tweets are more likely to visit third-party review sites and check out reviews on products or brands."

Source:  Blog post by Twitter 28th February 2013

Methodology:

"The study analyzed over 6,000 users and their site visitation behavior in the United Kingdom over the Christmas shopping season. The study looked at three different groups of users. The first group consisted of those users who were exposed to at least one Tweet by a mobile product or carrier brand. The two remaining groups of users were control groups: one consisted of Twitter visitors who were not exposed to mobile/tech brand Tweets, and the other represented the average internet user."