[tptacek]

When Friend A 'liked' an event on Facebook that arbitrary other people in (or even out) of her friend graph could also 'like', Friend A did something dumb no matter what Facebook does.

I wouldn't be arguing if Facebook betrayed A's private details to an anonymous search. But when you declare interests to Facebook, you concede your privacy.

[imajes]

You're suggesting a write implies a read too. I don't know I agree with that- just because i 'liked' something doesn't imply I get to know who else did.

The way I see it is that A's private details include her activities on the site (she's got her priv settings way high....) so presenting that information to people she's not connected with seems analogous to presenting it to anonymous users.