Upgrading My Account On PTC

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I have some extra money to invest and I was wandering where I should invest my money at. I was thinking of six month Gold or twelve month silver on Matrixmails, Premium membership on Linkgrand for two years, or Verified for one year on Wordlinx. I just wanted to know which website you recommend I upgrade on. Also note that I don't have any referrals for those websites. One more thing, I know it is very hard to get referrals on Clixsense and Neobux, but what about these three websites I mentioned? Thanks!