Not only are there hundreds of millions of singles on Facebook, pretty soon you will be able to find them via Facebook or third-party geo-location services.

The reality is that while Foursquare and Gowalla and Brightkite have well-established user bases and have built out many features — and arguably benefit from focusing on doing a single thing well, as opposed to being a hydra-headed monster like Facebook — there is too much fragmentation in the market for the current state of affairs to continue. Already, services such as Check.in (from Brightkite) are emerging to try and bring some semblance of order to it all, and others such as Digg architect Joe Stump’s SimpleGeo are providing tools that any company can use to add location-based features.

Read what Matt Ingram has to say in Will Facebook be the One Ring for Location? for more.

How about Facebook May Share User Data With External Sites Automatically.This makes Facebook Connect opt-out instead of opt-in. That is troubling if it’s not clearly explained and easily managed by users. If it’s done well, it could be great news for dating sites who could get basic information to target visitors and help convert them into members and subscribers.