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.
In today's top stories: Google had a busy first day at its I/O developer conference, issuing updates for just about everything — from Google+ and Gmail to Maps and Search. Android smartphone ecosystem in Q1 2013 was completely dominated by Samsung. Finally, Apple’s App store hit 50 billion lifetime downloads Wednesday.
Check out the video above for more on these stories.