Since I created a high school class online at the very beginning of logging onto Chinaren, it has recorded my history of junior high school, senior high school and college. At that time, I didn't worry about anything because so many people were using it. Based on this, all personal real information was saved to the alumni directory of Chinaren. Chinaren is also one of the few websites where I log in with real information.
So far, Chinaren alumni directory has been in good credit and there have been few cases of personal privacy leakage. Renren.com once had problems of personal information leakage, and at that time, you could find many people's personal information through Baidu or Google search for Renren.com. Now, this problem of Renren.com may have been solved. Personally, I haven't registered in Renren.com, so I haven't paid more attention to it.