Facebook is in a different league
A couple of years ago I tended to assume that Facebook was simply the fad for the year and that something else would soon be along to be the next thing. However, that has not happened and Facebook is building every stronger legacy links that will make it hard to shift.
One of my favourite pastimes, when I should be working, is to play with Google Insights to looks at trends. Insights lets you track the search terms that people have entered into Google.
The chart below shows a comparison for FaceBook, MySpace, and Twitter.
For those who think Twitter might be the next Facebook check out the table below which suggests Twitter may have stalled, which tends to match data about the number of users.