i believe that people post threads with polls to compare their thoughts or experiences and see whether they fall in the majority or minority....polls are very useful to get a rough idea regarding public opinion.
it can make a person who is lonely and shy and afraid to speak their mind out, feel that what they want to express is also the way how many other people feel .....and thus might help them to be bold enough to speak their mind out even if it seems like revolting.....
Right now only this is what comes to my mind regarding why people create polls..
will try to look further into the topic
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