What steps will you take to ensure that the image you project on LinkedIn and other social media sites is professional and positive?

Increasingly, prospective employers are using social media to discover more about their applicants.  It is important that all of your social media sites project an appropriate and positive image. This, of course, includes a LinkedIn Profile that highlights your job skills, experience, etc. but it may also apply to other social media sites such as Facebook or Twitter.  There are numerous instances where applicants have been eliminated because of something that has been found on one of their social media sites.

What steps will you take to ensure that the image you project on LinkedIn and other social media sites is professional and positive?