Facebook works as a hub for connecting friends, family, acquaintances & general thoughts. That hub is also used as a place for lurking, flirting, gawking, and poking. All of this goes without saying, but for me personally, when i stumbled upon something that in a world without facebook, would potentially never have came to be, & therefore would have never been able to make me feel so... lousy, i found myself hating it's existence. I try not to be jealous, or envious, but in truth, letting go of things can be extremely hard for me, & a feeling of betrayal from a person you love is even harder to swallow.
In the end, i remind myself to let it be. I can't control what happens around me. What will be, will be... not to self: if it hurts like hell, that's just life. I'm just trying to get through each day with a smile on my face, & the hope of maintaining happiness & peace.