Maybe there could be a like limit which will not let you to like many messages fast?
(Sorry, I do not know how to categorize this 
…)
We do have a daily limit of likes, that’s controlled by the setting max likes per day… but it sounds like what you’re asking for is more of a rate-limit? Are you running into problems where some people are liking too many posts too quickly? Can you describe the problem a little more?
「いいね！」 1
Well sometimes people like posts too fast and that annoyns. For example, I want to check my other nofications but the like nofication spams. I know, there is a way to not to get nofications from likes, but I think there should also be a like limit which won’t let you like fast in one thread, or something like this.
Something like cooling down rate?
「いいね！」 2
Yeah, something like that.
Instead of restricting what users can do, coalescing multiple like notifications on the same topic or post, or from the same user into one might be a better suggestion?
We also have a few cases where users like a lot of posts from another user a bunch (badge hunting?) and I can see that this can be annoying in the notification list.
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We already coalesce multiple like notifications on the same post from different users and from the same user on different posts 
「いいね！」 4