A sure-fire clue is when someone asks to be your friend who already is, but there are lots of things that make me think it might be fake including but not limited to people with:
- no friends in common
- friends in common but not linked by geography or all girls
- no groups in common
- not enough or inappropriate content (all games, spelling mistakes, links to websites that have a ton of ads, )
- different name displayed in the URL than shown in the display
Because I never add a friend that I’ve not met if I don’t recognize them I don’t typically add them anyways, but rather start a message asking them where it is that I know them.