Deepliking is liking pictures or posts on social media (like Facebook or Instagram) that have been made several years ago which you didn't like at the time of posting, but have stumbled across recently and liked. Social media has stabilized in it's platforms, compared to the early days. Therefore users can now browse several years of friend's pictures or posts. For long friends deepliking is akin to reminiscing the old days when you were younger and having fun together. For new acquaintances deepliking is showing an interest, which can be perceived positively, but also negatively (as in social media stalking).
by smold January 1, 2015