T-Mobile has been switching the Sprint Executives over to new Social Media handles.
For example, John Saw is no longer @SprintCTO. He's now @JohnSaw: https://twitter.com/JohnSaw
Certain executive's accounts are no longer active. I can't tell if it's because they've been let go, or if they're in the process of reorganizing everything. I guess we'll see over time, but I imagine everything is getting an audit.
Social Media is something that T-Mobile always did better than Sprint. In fact, Sprint's efforts on Social Media were horribly disorganized and haphazard in my opinion.