Welcome to this morning's edition of "First To Know," a series in which we keep you in the know on what's happening in the digital world.
Today, we're looking at three particularly interesting stories. Sony debuted the long-awaited PlayStation 4 at an event Wednesday evening, without actually showing the console. Twitter has announced its ads API, which will allow partners to get more out of their Twitter advertising. Finally, Billboard has made a change to its music ranking methods with Youtube popularity now helping a song on its way up the hot 100.
Check out the video above for more on these stories.