if so how I can know if a site become scam

Giving a quick check on their Twitter message -- it has a link in regards to the site issue -- that would be a good start to know

In regards to finding legitimate information about scams, always remember that the search engines are your best friends, and always do your homework ( that means, don't relay on just one source -- collect as many as you can, validate each site's opinions, dissect the 'cut-and-paste' sentences and quotes, and ensure the info has links and sources to back up it's proof )

A lot of Forums have now started their own opinions of new and up-coming sites, and their members are already being active in providing info ( to the point some threads are so heated and debatable, it's not for the faint of heart so to speak )

Again, giving a link or two to these sites isn't really allowed in the ClixSense Forums ( just to be on the safe side ) -- and let your fingers and keywords do the searching

start with ems and mmg, both are a portal so share this kind of info.

oh ya i want to add, scam or legit status was not the thing i always looking for from PTCI, but that blog offers (pretty much) detailed info about a site (ie earning, payment processor, feature and so on), it was like a library to me.