this girl probably likes to get close to multiple guys at once, i dont mean intimately per say, but she likes the attention of boys and sort of plays her mind games in her own weird ways, in this case facebook and her friends.. i've seen this happen so many times and its always a similar trend ...just stay away from her, unless you really want to be a friend i'd just move on, don't ignore her say "hi" ask how she is but don't get close because it sounds like she'll cause problems within her clique of her friends by being gossipy and annoying...