Manage your digital footprint

First, make a list of all social networking sites, online services, and smartphone apps where you have an account. Google your full name (within quotes) and your email address to find accounts you might have forgotten about. Systematically, start closing the accounts and unsubscribing yourself from the services that you do not use any more. Try websites like AccountKiller.com, DeleteYourAccount.com and JustDelete.me for quick links and howtos.