Why not? Isn't late better than never?I don't think I'd really want to be notified for a "like" on an old post...
I get "likes" on some of my older posts on TrekBBS days or even weeks after they were originally posted. It just happens sometimes that someone will be catching up on threads, or there might be a new person who happens on those posts. I don't mind.
As for what people like... well, most of my recent ones were for writing-related posts, and the most recent one was given because a friend and I share an appreciation for Heinlein. At least I assume he clicked "like" because I mentioned TANSTAAFL.
I have another reason for preferring posts to "likes" here on CFC, though. As my sig and usertitle mention, I host a writing competition in A&E. Written comments are an integral part of this, as the participants are in this partly for the feedback that lets them know what people liked or didn't like about the stories or poems they produce.Still, I can't really oppose it. Though it's rarely acknowledged, reputation have an impact on motivation, and it's a feedback mechanism for that, however imperfect. The long-timers will continue to base reputation on the quality of posts as they already do, and perhaps it would be encouraging for newcomers.
Just clicking a "like" button won't do it for that, because there's no provision to say why something is liked.
And that's something to consider with a "like" feature. Some of us address multiple points in our posts, addressed to multiple posters. If a "like" is added for that post, it doesn't say which part of the post is liked, or if everything is.