What is true about the privacy risks of social media?
选项：

A:Our personal information may be leaked by some of friends, colleagues and companies we interact with on social media.;
B:Identity thieves tend to gather personal information from the information available on the social media.;
C:It is easy for malicious people to track our whereabouts, if we post the location in social media. ;
D:Posting your full name, social security number, address, phone number, or account numbers in social media is risky.