Out of all of the incredible tools Facebook has created for marketers, perhaps the most useful is Facebook Pixel.
The tracking pixel allows you to monitor how successful your Facebook Ads actually were—giving you more accurate conversion rates—and create custom audiences based on site traffic. These are huge, exceptionally valuable benefits.
Two years ago, there were two distinct Facebook pixels: one was the conversion pixel, and the other was for tracking audiences. Earlier this year, Facebook combined these two into one upgraded tracking pixel!