In which site should I invest

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I have some 50 dollars in my paypal and alertpay accounts which I wanted to invest in some website in form of an upgrade or/and referral pack. I am finding it quite difficult to decide in which to invest. Well bux.to looks to be a nice one but they are having payout problems with payouts being delayed for long times. So I need an advice regarding a site which gives nice returns and has an early payout.