It is not the first time that I say that social networks seem useless and a tool for flamewars, but still people use them to post photos and chat.
In the networks you add who you want but there is a lot of cenutrium out there that is adding to everyone.
What's wrong with all this? Well, the so-called supermodel babe you add to may be a pedophile cunt who wants to troll others.
If you are still going to continue adding to everyone, I recommend that you install Friend Verifier.
Friend Verifier performs a scan of your connections and friend requests to compare them with the database of stalkers created by the authorities.
This database has registered more than 800.000 sexual harassers who have been on trial in the US, but can also be registered from other countries due to moves.
Official project page: http://friendverifier.com/
Source: Future Technology