if YOU know the details about her last breakup without her telling you - from her online sharing - then you should realize she will do the same thing to you when things end.
If YOU are on steroids, have a bald spot, can't get it up sometimes, enjoy wearing womens panties, or just post on knitting sites from time to time, she will share this info with 4,999 people upon your breakup. She'll enjoy the white knights promising to kick your ass and how they'd never treat a queen in such a terrible way. And you won't enjoy it.
So, yes... Run.