My friend keeps adding strange men to her Instagram account just to receive compliments from them and reject them. What that's going to do for her?

That kind of behavior makes an insecure, attention-seeker feel like someone. That feeling wears off pretty quickly though - thus the need for 'fresh blood' all the time.

make them all like me. Heartbroken losers in the end.

Prop up her ego temporarily

Some women need constant adoration lol