I think like all things in life, moderation is key. Memes are great in that they represent a group-based idea of something that is funny, interesting or literally exists. They can help like-minded people connect. But I think lately the word meme has come to have some of the same properties as the word fuck; It's easily used in many contexts. I think this is dangerous because it can lead people to be lazy in their critical thinking. i.e. "Why is that like that?" "Because meme"