Everything you use on a platform is not yours (name, alias, configuration…) you only have the usufruct.
I have seen people claiming that a platform stole his/her nickname. Other people claiming that some of the changes done in the user data policy is not “fair”.
Every day, I read comments about some related to it.
I expect that a social network creates the possibility of having ownership of the username or other assets of the platform.
Before that, they will build a marketplace based on their own token, as the basis of the trading activities.
Who will be first in the occidental side of the world?
WordPress
Google + 
Facebook