Social-networking sites are very popular for people to use to make friends, connect to each other, spend time and share their personal information such as Facebook and Myspace.
.... I feel "connect with each other" and "spend time"Popular social networking sites such as Facebook and Myspace facilitate people to stay connected, make acquaintances, share personal information etc.
According to the article, the author pointed at people who used social-network to share bad stuff which is not supposed to be posted on the web.
This line sounds confusing. It does not deliver your idea properly... What do you mean by this sentence? Is it that the author criticizes the people for abusing such networks to promote unethical activities?
People who post
ed bad stuff they don't know that they could get in trouble.