What about this year? How impressive is the growth?
Facebook clearly boomed and reaches now 15,4% of the internet population. Youtube (34,6%) is now bigger than wikipedia (29,1%). Twitter is 3 times bigger than one year ago (but it's still only at 0,3% global reach). Myspace stagnated (13,7% in june 2008, delicious is among the losers with only 0,2% reach.
I didn't measure the blog networks last year but the blogging community is an impressive collective force. For instance, blogger reaches 23% of the internet population and its challenger wordpress is at 11,4%
A funny statistic, Yahoo! geocities is still strong with 9,1% reach (almost 50 times more than delicious!)
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