Is there any reliable metric where I could auto invite farcaster addresses to Ethos and be confident we won't get sybil farmed?

< 5000 FID?
Followed by [X,Y,Z] ?

I have clicked around some of the people asking for invites and sometimes the profiles are just 100% spam :( 

Would love to set it up to auto invite for top peeps

punk 3983
gp @ 0x5f capital
ceo ethos
/ethos-network

I've heard Ethos many times but I didn't have any chance to try it. How the invite system works? I would like to give it a try.