Part of managing your online reputation is making sure your social networking profiles are up to date and that they are a professional representation of who you are and what you do. Every social networking site gives you the opportunity to include a profile. In the past I've written about making sure you have an Amazon.com profile.
Recently I took a look at my Google profile and noticed it was out of date. If you use Gmail, Google Reader, Google Calendar or any of the numerous Google tools, then log into your account and see what you have on your profile. Others can see it so make sure it represents you.
For example, I was looking at a few feeds in Google Reader and I clicked through to some shared feeds (feeds my "friends" bookmarked and shared so I can see them too). I clicked through to a couple of profiles to learn more about the person who shared the feed. That's when I realized my Google profile needed updating. When you're logged in to one of your Google accounts, you can usually find a link at the top right that says "My Accounts." From there you can edit your profile.
Of course there are your profiles on Facebook, LinkedIn, Twitter, etc., to take a look at (at least once a quarter to make sure they reflect your current reality). Nancy Marmolejo of Viva Visibility has some good posts on how to create effective social networking profiles.