Even if you don’t mind having all of your accounts linked to Facebook, having the same list of friends across multiple sites is still a problem. As I said, Facebook is more personal, and contacts from a site for a specific purpose (like churning out cheap content) may not be the same people that belong on a personal friend list3. This is only one site, but if more sites merge their friend lists with Facebook’s, Facebook will quickly become overcrowded. If everyone I follow on Twitter, Quora, Flickr, etc. started showing up in my news feed, I’d hardly ever see the kind of personal items I actually care about.
— eHow goes Facebook exclusive for logins and profiles, and here’s why it’s bad
