Facebook Archaeology 

To dig up old facebook posts by liking or commenting, flooding people's facebook spaces with posts and statuses from five years ago or older. This practice is most successful when done to posts made before facebook likes were implemented, staking the archaeologists' claim.

"Oh man, my wall is filled with embarrassing prom photos. Looks like someone did some facebook archaeology last night."

Facebook Archaeology by Forgaman December 1, 2014