Three observations on Hitwise's latest data on the competition for internet users between Myspace, Facebook and other social sites. First, Facebook is the big winner: Mark Zuckerberg's college social network has gone from 7% to 11% of all US visits to like sites, since opening up beyond students. Second, News Corporation's Myspace is under no immediate threat. Even if Facebook kept up the current extraordinary rate of growth, it would take several years for it to overtake its main rival. The struggle for share on the internet is becoming ever more like ratings battles in TV, more like inch-by-inch trench warfare than dramatic pincer movements. Third, no other sites really matter: Bebo is one of the most rapidly growing, but it's still just a tenth the size of Facebook in the US. An acquisition of the site by Yahoo might help in the UK, Bebo's home territory, but it won't change the Sunnyvale internet company's fortunes in the US.