BuddyPress.org

One word of caution using Facebook and Twitter to promote your page. Make sure you have some sort of related posts or links to other content on your site very prominently displayed or else your bounce rate will be off the charts! People will click and sample, but to hook them you will have to be a bit more clever. Making some content hidden is a good idea but it has a tremendous downsides in terms of SEO.

The Facebook/Twitter connect options are vital for growth because as previously stated no one wants to sign up for yet another website.