Remember that Facebook and Instagram are public forums. No woman wants their nice pictures sullied by your thirsty comments. If you feel the need to compliment a woman's picture (which is almost always a bad idea), at least have the good sense to do it via message. If you comment on her photo, your thirst will be documented for the ages: girlfriends, future employers, and future father-in-laws may stumble on your declaration that you would "be her workout partner any day" or "help her wash that car next time." Save yourself the embarrassment and keep your clever comments to yourself.