My Doubts................?

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immet with so many topics for discussion? some of them r joks, other ones are serious. some topics get a large number of reply? some other topics even stand without resposnes? y it is so? even funny things get reply? serious matters avoided? i discus this to my friend, he told people earn money with these topis? is it possible? for money people post some foolish topics? and give reply to all? i am a new person here. guid me with reply