Baffled

I don't really do anything with my LJ anymore, but it still exists. About two weeks ago, I started getting a lot of likes out of the blue on two specific posts I made, one very recent and one nearly eight years old. All of the likes are from Russian accounts that left a like, then immediately deleted the account. Does anyone know what the point of that is? If they were spamming to drive people to click their LJs I could understand it, but why do that and delete the account immediately afterward?