Brian Solis delivered an interesting analysis of trends among social media web sites on his blog today. According to the data provided by Experian Hitwise, Facebook visits are up 194% over last year (and now boast an almost 60% market share among social media platforms in the US) and Twitter visits were up a staggering 1170% over last year. The once-mighty MySpace is on the decline, down 55% YoY visits.