Is Ucash.in, URLcash, and Shareapic legitimate?

Tweet

I'm just curious, is Ucash.in, URLcash, and shareapic legitimate? If not, please let me know! I don't want to be wasting my time earning on them only to reach the payout limit and figure out that they don't actually pay! For those who don't know what they are, you can check out my profile & follow the links! I'm also curious, what other ones are there like the ones I listed above? I'm trying to test them all to find out which is the best, quickest-paying, and highest-paying! Thanks in advance.