- Sharing produces an estimated 10% of Internet traffic
- Sharing produces an estimated 31% of referral traffic to sites
- Twitter accounts for 11% of all sharing referral traffic (Facebook 38% & Email 17%) for those that clicked through
- Twitter accounted for 8% (down from12%) in regards to raw sharing.
I also want to mention a recent study, 2011 Search Engine Ranking Factors, that took a look at social metrics that affected search engine rankings. From this study they found that Facebook shares were considered more influential (.28) versus the shared URLs in Tweets (.17).