ReviewAndJudge is a handy web app that helps identify the good sites from the bad. If you have a site you think might be a scam, you simply enter it into a search field and you'll be presented with a report.The details of the report will vary based on what ReviewAndJudge finds. The review of Lifehacker indicated that we're very popular, Google likes us pretty well, and that we're not too old and not too young. Each of these things can help identify whether or not a site is a scam. If it's too young, that's not necessarily a good sign. If it isn't popular and Google hates it, you're probably going to want to steer clear. If these indicators aren't enough information for you, your report will suggest additional ways for you to get more information.
If you're not sure about a particular site, this is a good search to conduct. It only takes a few seconds and can provide you with some useful statistics.