Under existing FAA guidelines flying a drone for personal use is completely legal, as is recording video of your drone flight. But if you use the drone for commercial purposes, say for example to record an aerial view of a real estate property listing, then you‘d be breaking the law.
But the FAA just found another loophole in their efforts to curb the popularity of drones. It turns out that if you record a drone flight video and post it on Youtube you may be breaking the law if an automatic advertisement is launched within the video. According to the FAA, because you make a few pennies off of that advertisement you are now using your video in a commercial capacity.