Here are the issues that have the tech world abuzz this morning:
A group of music stars, including Pharrell Williams and The Eagles, are threatening to sue YouTube for $1 billion unless it takes down 20,000 unauthorized videos.
Speaking of suing, Sony threatens to sue Twitter unless it remove tweets containing hacked emails.
North Korea is back online after a mysterious 10-hour Internet shutdown.
The Mississippi attorney general is backing off — for now– from his punitive anti-piracy investigation of Google, which was encouraged by the MPAA.
For the first time, Apple is sending an automatic security update to Macs to protect against a newly discovered vulnerability.
Google is now including song lyrics in its search results – with links to Google Play.
A new drone video reveals major progress at Apple s new spaceship campus in Cupertino.
Is Twitter CEO Dick Costolo really on his way out? Some high profile investors think so.
Facebook adds its popular Stickered for Messenger app for Apple iOS.
Apple still doesn t have an official Twitter account, but it now has a Tumblr blog for iTunes.
Live TV on your phone? Apple s new reverse AirPlay capability will let you stream your Apple TV to an iOS device.
CNN/Money says Apple s Tim Cook is its CEO of the year.
Are more campaign ads coming to your Timeline? Facebook says its experiments prove ads on its site can generate political donations.
At top: Pharrell Williams performs on Dec. 22, 2014 in Tampa, Florida. (Photo by Alexander Tamargo/Getty Images for iHeartMedia)