Make your profile public. Many potential employers will want to review your social network account.
Remove highly personal matters in your social networks.
Maintain consistency. Employers will notice any inconsistencies.
Make sure your contact information is up to date.
Be organized and trustworthy, even on your social network accounts.
Think about your self-branding. Tweet or update information about topics you consider yourself an expert in. Join groups related to these topics and provide a fresh outlook.