how can you guess if a ptc, hyip or other earning site going to CLOSE?

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with the mushrooming opportunity to earn money on line, its very difficult to predict which is which.after visiting forums and discussions about easy money on line, i have 'nt count how many i have joined. some have closed others still existing but on the remaining sites i'm still optimistic that it will be in my favor.how about you guys do you have any doubts with regards to the site you are in?any ideas you can share.thanks...