I sometimes help clients wrestle back domain names and corporate social media accounts from disgruntled ex-employees or other unfriendly parties. All businesses and organizations should keep in mind that these are valuable assets. It is important that they are registered in the business name, and not that of an employee or service provider.
And if use or control of those accounts resides in an employee who is about to become an ex-employee for whatever reason, make sure that control is passed back at the time the employee leaves.
Otherwise, the disgruntled person with control of those can lock you out, prevent your use, take down your web site, cripple your email, publish embarassing things, and make you spend time and money to recover control.