WeChat has been the very popular communication tool, and many foreign people have also used it. WeChat is more private than other social soft-wares, which makes it be favored by many users. The important function of WeChat is that users can keep trace of what they are interested in and then they can also release this information. This function is used by the businessmen, because they like to release the information of great discount, the one who shares the information in his wechat can buy at the low price. Then the criminal incident happens. Some users will register with their real information, which will be let out and the bad guys will make use of this information to do criminal things. The best way to avoid being cheated is to never believe the super low price. In short, there is no free lunch.