Catholic and Enjoying It! and Intentional Disciples are discussing the role of friendship in the Church -- here, here, here, here, and of course here. The proximate cause (at least on Mark's part) was a commentary on friendship by papal preacher Fr. Raniero Cantalamessa.
This has led to a combox discussion on how unfriendly typical American Catholic parishes are toward newcomers, as compared with the welcoming nature of Evangelical congregations.
I think it would be useful, though, to maintain the distinction between friendship and community. Friendship, in the full-bore "one soul in two bodies" sense, is necessarily personal and relatively intimate (which may be why Fr. Cantalamessa insisted that "it does not have a sexual component").
Friendship doesn't scale up the way charity does; one soul in two thousand, or even two hundred, bodies would be too much to ask for. Even if they wanted to, people can't expect to be friends with -- which entails having "the same tastes, ideals, interests" as -- more than a handful of others, much less a whole congregation.*
The ideal is a genuine community within which friends can be found. What I don't think will work any better than the "plastic bonhomie" community building efforts Mark derides is an effort to make a parish a place where everyone is everyone's friend.