Advance notice of another enabled-by-default option to disable in privacy settings.<p>Edit: To clarify, I signed up for facebook in 2004 because it offered simple social planning and sharing. Today, I think FB's photo and event apps are very well executed.<p>Everything else is just fluff. Fluff that, if not disabled, can spread information about you without your knowledge.
Whereas I might now and then decide to share my location via services like Foursquare, I will NEVER share it on Facebook.<p>I just can't trust them. They've proven it over and over.<p>So I have to be extremely selective with what I share there, and outright lie in some cases.<p>It's a dysfunctional relationship, and it won't last.<p>They're in for crash.
FWIW, the "latitude and longitude, but also your altitude, heading, and speed" is the standard set of GPS data.<p>Also, some of the relevant Javascript is here: <a href="http://static.ak.fbcdn.net/rsrc.php/z3RA8/hash/273u6o5s.js" rel="nofollow">http://static.ak.fbcdn.net/rsrc.php/z3RA8/hash/273u6o5s.js</a>