Years ago I was like Richard Stallman is totally crazy!, saying stuff like don't post my pictures on Facebook and such. Today his fear is really really justifiable...
Surely, SURELY RMS is not one and only person you have ever heard in your entire life warn about the dangers of putting personal information online, or the dangers of government surveillance. That's all just common sense and being relatively informed and skeptical about the world and the people around you.
RMS says a heck of a lot more than "don't post your pictures on Facebook", much like PETA says a lot more than just, "treat animals ethically", or Earth First says a lot more than just, "don't destroy the environment". If sea levels rise much more in my lifetime, one lesson I will not draw from it is, "Earth First was right!"
If you care about this stuff, donate to the ACLU, not the FSF.
Stallman was asking to not put any kind of his pictures on Facebook, which means your face is recognized now by Facebook, and there's plenty of things to do with that...
Why, exactly?
Usually I like people to know where the photos I share publicly are taken. Indeed, that's why I go to the trouble of captioning or manually geotagging them.