I believe your strongest here is btctasks.com. A site that distributes small sums of BTC for filling out questionnaires, or other things...those exist. Pitch low hundreds. Your Libra ones rely on Facebook having a worthwhile coin, to be useful, assuming it means the "Libra" coin. Your BTCTrippler.com sounds like "give me 0.1 BTC and I'll give you back 0.3 BTC"...ugh, sounds scammy