Do you use any GPT sites ? I have used CashCrate and I have like $50 in my account there. It's not a big earner but better than PTC sites. But never should promote with AdSense. They ban you.
Anyone else you any other GPT sites ? I don't mind joining if there are good site which pays.
I think it's okey to exchange referrals since you get pay only if your downline earn money. But don't post referral links in the topic.