How can i start a discussion which is goig to have a lot of responses?

You can always post something controversial. Politics and religion are usually good bets. Say something outrageous and then duck and cover for the fallout. If you are really lucky you may even get to keep your rating. Good luck.

There are many methods for you to find out. You can invite more friends so there will be more to reply to your posts. Though this does not mean that all your friends will respond to you. Let's say five out of 100. So if you want to have more responses, add as many friends as you can. Another method is by replying to your friends who have responded to your discussions. This will make a mutual agreement that you are going to reply to each other's posts. I hope this will work for you. Good luck.

i think there's no real rules to have successful discussion, it may be just luck after all. but what helps is: catchy title short but interesting text at the body of discussion. easy to respond to. general interest topic. etc. So far only one of my discussions made 31 responses yesterday, this is my biggest score, all other discussions were under 10 responses or under 20 at the most.