Elon Musk says more changes are coming to Twitter, including giving users the ability to pick from a trove of dormant usernames. Musk announced Friday morning through the service that Twitter would “soon start freeing the name space of 1.5 billion accounts.” The idea of jolting interest in a platform by giving current users a crack at these high-status handles is not new, however: Yahoo, amid fading relevance, made a similar move with old email IDs back in 2013, according to The Wall Street Journal.