Using your friends' Facebook posts and comments to sell or promote one's own products or services. This is often in direct competition to the original poster.
Original post: "I just started a Mary Kay business! Please buy my self-tanner."
Comment: "Mary Kary is alright, but I use Avon's and it works best. Here is the link to my site..."
Original post(er): "Hey don't facejack me!"
Comment: "Mary Kary is alright, but I use Avon's and it works best. Here is the link to my site..."
Original post(er): "Hey don't facejack me!"
by pattiwordsmith March 28, 2011
Someone or group of people that comment on your Facebook post and then carry on to have their own unrelated conversation.
I posted on Facebook about my swollen ankle. Bob and Margret both replied then carried on talking off topic to themselves on my post! You fecking Facejacker!
by TC5712 March 15, 2016