"Atomkeep is a service that lets you sync, import, and merge your personal profile data across multiple services.
Changed your address? Don't bother logging in to each place to make the change. Instead you can edit your AtomKeep profile (which contains nearly every conceivable field) and then push it out to just the services you want, or all of them at once. You can also bring in your profile data from any service you're signed up for, and merge it in to your Atomkeep profile to push back out to other places.