It actually is, it means that she liked the meme, yes, but do you laugh at all memes you like? Doubt so."Hahaha" isn't a comment at all,
"Hahaha", "This meme made me laugh, good job"
It's the same scenario. In youtube, we comment on videos. Here, we discuss memes. In youtube, people are free to comment. In the forums, people are free to post replies.This is a forums, and not a YouTube video. Don't compare the 2 together, there's nothing that resemble them.
I'm done with this topic.We are no one to judge if a member decides to express their laughter.