BuddyPress.org

You don’t? What do you want your groups to use polls for?

Something like what’s the hottest movie right now?

They could easily make a topic in the group forums for that and they’re not restricted to a couple of answers.

Polls are also not part of a social network as you can’t see what users voted for what and users can’t give arguments either, so it’s anonymous. If they also added comments and ratings and stuff to the poll, then maybe it could be something for a social network.