The latest State of the Mobile Web report from mobile browser company Opera shows that Facebook is now the most-visited social network on the mobile web. The number of Opera Mini browser users visiting Facebook grew by more than 600% during 2009. Twitter, although not as popular overall, saw its usage increase by over 2800%, more than any other social network.
Here in the UK, Opera saw the number of users grow 19.3% year-on-year and the number of page views increase by 50.1%.