Family member big data may check out.

If the basic personal information of your qq number is filled in correctly, then the cell phone number is likely to be associated.

If your birthday information is filled out correctly, then your birth year and month and day can be deduced, and some passwords may be able to be cracked.

If your qq is associated with some tencent software such as king of honor, all k song etc, then your region may also be exposed (for example, there is a location function on all k song).

Through your cell phone number can be through the Alipay information real name you or looking for your microblogging, WeChat. And then through your release of some of the circle of friends with location information to say or microblogging know which school you are where you work, and even your home address. You can also send your friends a phishing link through your friends social workers to you, a lot of methods but it is not impossible.