Any recommendation for a reliable PTC?

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Hi everyone! I want to spend credits on Downlineref for referals, but most of the PTC sites are likely to be scams quickly, can anyone recommend some reliable sites that can have good earnings with referals? (The only site I trust is Neobux, but it's hard to get any on it since almost everyone has become member of it) I don't want to waste credits on scam sites. Thank you very much! :D