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A Facebook conversation usually between two people on a post, where they comment back and forth, each liking every comment posted by the other person.

This alternating liking is like a ladder - a "Like Ladder".
person 1: man, that facebook convo between fred and sally is so annoying. they keep liking each other's comments!
person 2: i know right! it's a total Like Ladder.
by shenanigans345 April 29, 2011
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