Yeah, people on social networks have an interesting definition of "friend". To me, a friend is someone who I interact with regularly. To users of social networks, it's anyone that you have perhaps maybe heard of or seen in the hallway. I used to use Facebook, and people I didn't know added me as a friend. I reciprocated ("yay, I have a new friend") but still never interacted with that person.

Now I don't bother with social networks. I have contacts that I keep in touch with regularly (mostly on IRC), and if I need a drinking buddy or a job I have no trouble finding it.