Sure, it is possible. But not smart. They could have as well built their domain where all the goodwill would be collected as well from those social media accounts.
My strategy is that my domain/website is the primary asset. Then I create social media accounts with the purpose of building community there, but also driving them to the website and building separate independent community there, including mail list, comments, if applicable etc.
Just to illustrate, for my Elix project compare twitter.com/elix that is not mine and created in 2008 with 150 followers with twitter.com/elixcom, which is mine, was created 10 years later and with 395 followers that I will grow into hundreds of thousands.