The act of using a T-Mobile Sidekick 3, LX, SLIDE or ID to access Facebook mobile.
Known for its' addictive effects. When linked to an e-mail, the Sidekick user will receive notification when anything having to do with your Facebook page occurs.
Kyle: "OH MY GOD! LOOK AT WHAT SHE WROTE ON MY WALL!!!"
Miranda: "You better facekick something back to that bitch so she's knows what's really good!!!