'Facebook fatigue' kicks in as people tire of social networks according to The Register.

The average length of time users spend on all of the top three sites is on the slide. Bebo, MySpace and Facebook all took double-digit percentage hits in the last months of 2007. December could perhaps be forgiven as a seasonal blip when people see their real friends and family, but the trend was already south.

I agree with this sentiment: I rarely use Facebook these days, and when I do it's only to look up email addresses so I can send wedding invites.