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. Yahoo published its list of the top searches for 2013, as well as its first list of the most viral blogs on Tumblr. According to a report, scientists have developed malware capable of transmitting data via inaudible sound using a computer’s internal speakers and microphone. And Apple purchased social media analytics firm Topsy for more than $200 million, according to The Wall Street Journal.
Check out the video above for more on these stories.