When you "like" everything on someone's Facebook wall. Comments, statuses, pictures, everything. This floods the person with notifications and is very annoying.
When your so-called friends refuses to "like" anything on Facebook wall out of jealousy... Comments, statuses, pictures, everything.
However, the same 'friend' can be seen likely every other Trival post on Facebook.
Jill: Loved your holiday photo's from Miami!
Me: Yeah, although I noticed Steve didn't like a single thing.
Jill: Really?! he's liked all my posts about my cat.
Me: Clearly he's on like strike.
An activity performed on facebook, in which the Striker "likes" every available post/event on the target's Facebook page, causing them to recieve a fuckton of notifications. Can often be used as a strategy to place highly in the target's "My Top Friends" checks. Although, ironically, if you perform a Like Strike well enough, the target may not be your friend anymore.
Dude, I totally gave Joshua a Like Strike last night, and now I'm his top fan! But he's pissed at me cause he got a shit-ton of emails from it.