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Now, that鈥檚 what I call investigative journalism. I got to spend an entire working day on Facebook, the latest time-wasting craze sweeping the internet.

If you鈥檝e been on the moon for the past month, you may not know that this is fast becoming one of the most popular online networking communities. Much like MySpace, you make a profile and sign up some friends. Then you can chat and generally muck about on discussion boards, like the Anti-Norman Foster group, illustrated on the site by an erotic gherkin flanked by two Millennium Domes.

I can鈥檛 imagine Richard Rogers is too happy that one of his buildings has ended up as the veg to Foster鈥檚 meat. He鈥檇 probably prefer to spend time on LinkedIn, the more grown-up rival to the student-dominated Facebook.

LinkedIn鈥檚 aimed at serious-minded professionals like you and I. There鈥檚 less frivolity, no chance of a virtual foodfight or any 鈥渟uperpoking鈥�, and invitations to join are much harder to come by 鈥� reflected in people鈥檚 lists of contacts, which include directors and vice-presidents.

On Facebook, in contrast, 鈥渇riends鈥� are not defined by such tedious technicalities as their jobs, but rather by how they are feeling on a particular day.

And, predictably, web stats reveal that the growth of LinkedIn has plateaued, while Facebook鈥檚 has rocketed in recent weeks. Clearly, people would rather throw virtual cakes at online contacts than build professional relationships with them.