I flock posts that are overly personal, not because I worry about LJ but because my LJ posts are automatically reposted to Facebook, where my coworkers could find them. So my post about dogs and cats that begins with how "like with people I go both ways" -- I don't need my whole office reading that, in that context :) I keep as much as I can out in the open but talking about sex, porn, bitching about works, etc. - flocked :)