"The new-this-year, yet somehow-already-ubiquitous Facebook Like button has been around just long enough to generate some interesting numbers relating to Facebook users and web traffic.
The button, which launched in April at f8,
Facebook’s developer conference, is now present on roughly 2 million
sites around the web, from sports sites to news organizations and many
other kinds of publishers.
A media analytics lead on Facebook’s Developer Network Insights team crunched some numbers
and found that Facebook Likes don’t just generate interesting data
about the “likers” (a.k.a. Facebook users who are also active on your
website) themselves; this data also speaks volumes about clickthrough
rates, time on-site and other engagement metrics."
Read more at www.mashable.com