Feeling miserly with your mobile phone broadband data alliance? 3 has a slightly weird offering at the moment -- free access to Facebook until August 31 on all its mobile data plans.
The deal applies to all of 3's plans and to both new and existing customers. I can't actually imagine someone signing up to 3 just for three months of free Facebook access, but if you're already using them it's one way of eking out your data. (UPDATE: Turns out this even applies outside 3's own coverage areas, though be cautious about external links within Facebook, which will cost you the usual price.)