Social networks are great. They do present some security challenges and risks, however.
This guide describes the dangers you face as a user of these websites, and provides tips on the safe use of social networking and blogging services.
Dangers of Social Networking
Many computer criminals uses these sites to distribute viruses and malware, to find private information people have posted publicly, and to find targets for phishing/social engineering schemes. Below is a short list of users who may be using the same sites as you: