I disagree. For a long time I used to get confused by LinkedIn and Plaxo -- and Plaxo sort of spams people, so the category of professional networking sites (e

I disagree. For a long time I used to get confused by LinkedIn and Plaxo -- and Plaxo sort of spams people, so the category of professional networking sites (excuse me i'm getting this category wrong) isn't particularly reliable to me. Personally, that LinkedIn is a professional site doesn't make me take it more seriously.