This is a article that will talk about the people you should and shouldn't trust on a multiplayer server. If you are invited to a faction that seems some what friendly, make sure there is an exit you can escape through if you are betrayed. I am saying this because i was invited to my friends faction and i helped a lot, but after a while they called a faction meeting and then they kicked me from the faction and tried to take all my stuff! luckly there was an easy escape to get out quickly. So not all people are trust-worthy.

P.S. If you survive at least over 3 days, your ok.