Facebook is in the process of making some changes to their tracking pixel. The old pixels you've been using will still work for a while. Your old custom audience pixel has already been upgraded to the new pixel, but your conversion pixels will be phased out in the second half of 2016.
OLD PIXELS
NEW PIXELS
Have you been getting familiar with this?
What's your opinion on the ease of use with the new pixel system?
OLD PIXELS
NEW PIXELS

Have you been getting familiar with this?
What's your opinion on the ease of use with the new pixel system?