It’s hard to think of Facebook as an also-ran, but here it is: Some 59 percent of those who use social networking sites-like Facebook-say that their most important social networking account is their LinkedIn account. Last year, only 41 percent chose LinkedIn as their most important account.

LinkedIn is a painkiller. Facebook is a supplement.

This finding doesn't surprise me. LinkedIn helps people find jobs. Facebook reconnects with friends. The former meets a 'baser' need than the latter. Both are important but Facebook can be replaced in one's life easier than LinkedIn, since LinkedIn provides degrees of connection unattainable by offline means. If you didn't have Facebook, you'd just use other means to talk to the people around you.