you need to be aware of the privacy policy of the Social Networking Site provider and how you can physically change the default settings of your online profile.
You will also need to obtain third party’s consent for your use of third party’s information, photo or content in the online environment to avoid any claims for unauthorised use of copyrighted material and subsequent action by the third party or the provider.
You will also need to avoid making statements that are false and malicious exposing yourself to a potential action for defamation and exposing yourself not only to a potential claim for defamation but also to a potential claim for breach of the provider’s terms.
You need to be aware that information posted about you may be seen by third parties and future employers and used in cases of litigation or crime prevention and detection.
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Social Media 
If you are a user