Are you managing it effectively?
Everything you put online about yourself is a virtual window into your life. Your CV, holiday snaps, personal information, opinions and views; what may seem like harmless banter to you can be misinterpreted by others and you have to live with the consequences. We should all be more careful when posting information and think a little more about who could potentially see if and what they might think of it, i.e. would you want your boss (Or potential employer) to see what you got up to on your friends stag / hen weekend?
Interesting info graphic below from KBSD illustrating why our online reputation is important and why it is important to make sure you do your best to manage it effectively.