I have seen three people include a photo of themself when asking a question here at HubPages - in the last 24 hours alone.
What part of human behaviour triggers this? Why would they do this?
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It is out of control ego and/or a desire to be part of the cult of the celebrity.
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I don't know - I think it's a poorly thought out marketing strategy to try and attract people to their hubs. Particularly the pics with kids.
I guess putting photos can add higher percentage in getting more hits or clicks
Because they have the ability to do so. As long as no one gets hurt, why do you even care.
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