Of course you are right: There is almost certainly going to be a difference in the magnitude of a 'breach'. I still think this is way out of proportion. Let's

Of course you are right: There is almost certainly going to be a difference in the magnitude of a 'breach'. I still think this is way out of proportion. Let's use the example of your two circles. Assuming a few/some/most/all of your friends are in the same geographical area, how common is it to run into people from group A while out with group B (and thus open the possibility of group A people making comments you don't want group B to hear)? I know for me situations like this are very common. Just the other day I was leaving a restaurant with friends and ran into other completely unrelated friends who were sitting on the patio. I don't think that just because Facebook is an easier way for your clueless/inconsiderate friends to let stuff slip is Facebook's problem, is all I'm saying. Facebook is just the highest profile, most widely used method of having a persona online. That comes with upsides and downsides -- if you aren't comfortable with the risks you can simply not partake.