are internet and matching sites scams?

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online dating is very popular today. in a world that is addicted t othe latest gizmos and technology, it is just a natural evolution.plus, it is so easy and convenient to browse through all the many different profiles and photos to find that perfect match. but sometimes not all is as it seems. sometims ideally you wan ta reliavle sites tha screens all their members but that is just not always possible. are internet and matching sites scams?how do you protect yourself/can you identify a site if it is a scam?