I personally don't care about having a Facebook account any more than I be buffing up my MySpace account or a WoW character anytime soon. This cartoon sums it up my attitude pretty well: http://2.bp.blogspot.com/_zp_eKXDTiU0/SiQyLywcJ7I/AAAAAAAAE7...

However, I agree that since so many people use Facebook, it's a useful and important place to promote your business and for which to offer services.

It used to be that when we released widgets it was important to test on Blogger, Typepad, etc. but these days more potential users are on Facebook than Blogger. Of course, Facebook makes you jump through hoops to integrate anything with their site, but the large potential audience makes it worth it.