I read in a blog that it encouraged users to visit those sites. I personally dont see the need if I am already on LinkedIn. So have you used those sites? If so, whats your opinion of them?

I think their days have already come and gone. Social networks either come and stick and grow, or they appear and then disappear. I remember the hype on spoke, i made one and it sits untouched because it didnt seem to do much for me.

I haven't tried Xing, i'm signing up for it now though - i guess we'll see how that one goes!!

I think LinkedIn is the leader and the other ones may have been a close second. Perhaps those two dont hae the critical mass like LinkedIn.