Why do some post become more popular

I think it's no way related to the subject of the discussion or anything like generalised nature of the discussion at all. Because I have personally noted in my past two and half months time that exactly similar discussion of mine recieved only 4 to 5 responses and the same when was indused after few days by somebody else the discussion pulled some more than 50 responses. I think it goes in the friends ring pattern or the server which continiously and displys the discussions on to home page repeatedly with some programme which can be guessed from end. Whatever might be the truth but it;s very much disappointing scene when you don't recieve the responses and somebody after some days recieves so many responses to the discussion which exactly same to yours without any change in the words even, I mean a 100 percent similar discussion. This even can be a game played by a set of hidden friends. Unfortunatly I have very few sincere friends who care and respond my discussions some times. Wish you all the best, just work and don't expect so much, be happy in what comes to your fate.