I recently did the referral site get 4 friends in the attempts to get a DS. Ive done many referral sites so I can get referrals quickly and easily. I got the 4 referrals needed for my account and sent it in for approval. My account was put on hold indefintly because one of my referrals did an offer on the same day as me and apparently your not allowed get referrals in a short period of time.
I highly advise steering clear of any website run by Get friends network. They run the sites like get4friends or get5friends. Avoid them.