There are many private and industry-specific social networks. These, even more than the more well-known social networks, like Facebook and LinkedIn, can require a third-party perspective to ensure you are putting your best face forward.
Are you present on all the relevant sites? Is all of your information current? Do you owe answers to friend requests? Are there questions that you could answer to assert your expertise?
Don't leave your personal or professional brand to chance.
Have a strategy. Be consistent and be current.