>>406748887
My broad strategy with people I don't know is to first see who they're interacting with. If they're interacting with people I know then they get a chance. I'll talk to them if I want to try and verify them.
For people that sit in a corner and it's all names I don't recognize or are known randos then chances are they're on the chopping block. 
In addition if someone is a new user or user they will get a lot more leeway since the chances of being a newfriend are way higher.