In the past two days my contacts and best friends have invited me to join:
In the past few weeks there were invitations to other sites I had not heard of. There are networking addicts who join everything that comes along. Some of these sites allow you to import an existing profile, such as from LinkedIn, which is such a tempting feature for the networking junkies.
I see all this as a big duplicate content risk for the wannabe social networking sites. When most of the members post the same profile on numerous sites, do you seriously think that Google’s algo will let this content be displayed above the established sites? Ideally, the profile acceptance process should include a Google query to check for duplicate content, and then it should ask the member to submit a unique resume.