Currently, several online services have been created to detect fraudulent websites and services. Badbitcoin.org is an example. This is considered a trusted site, which provides a full list of fraudulent or verified frauds. Another service on @thatsascam on Twitter is also quite useful. This is a bot that detects spam. These bots check those virtual tracker accounts based on the retweets rate. Take advantage of such tools to minimize the risk of fraud.