do you choose interesting topics to discuss or just discussion every topic ?

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do you choose a interesting topic to discuss?and which content of subjucts you want to discuss,a daliy life,sports or music,and chatting? i find that most of the hot discussion subject is talking with daliy life,the day i do something,the day i have a bad mood,and my child get ill,but i like to start a discussion about sports and chatting.and i also find that people who post the hot discussion is the same one,and always post the same subject as the tiny things. so please give you own opinion?