"Of course everyone has a line, and no one is willing to share absolutely everything. Nobody is announcing, say, a credit card number—the girl who loudly recites it over the phone, temporarily forgetting she’s on public transit, notwithstanding. What we consider to be acceptable to divulge might seem contradictory or bizarre because the line we refuse to cross is so deeply personal. The most intimate confessional blogger who has no problem relaying her sexual activity from the night before may also loudly protest when Facebook data mines her profile and messages for more targeted advertising."