Irrelevant Responses

When people ask a question on facebook or twitter or wherever, there's often just a endless series of responses with people making puerile jokes, posting irrelevant gifs etc. I've scrolled through 100's of responses sometimes without seeing a single sensible response. Frequently my response is the only one that is sensible, but of course it's lost amongst the hundreds of asinine responses, so very few people will see it. Are these responses not all just a complete waste of time and space?