Which is the best way/subject to start a discussion ?

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Is there any specified way to start a discussion.Or is it the subject and its simplicity or complexity which blended with perfect timing and magnificently cool myloters sums up to great discussion success ? Often I think regardless of the depth of the matter. Clearly can the myloter community share their insights on the subject to make myloter the best place to have discussion ? If it is a great idea ,situation ar anything ! please share