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The purpose of seen is IMHO to make FB messaging more reliable than other service like text msgs or E-Mail.

Obviously there are many people that like to not give responses, including me sometimes. But I guess that shouldn't make you change that behaviour?

It's seems very rude and arrogant to the other party in the conversation.

On the other hand when the 'seen' thing wasn't happening the other party could at least think that you just haven't checked the message yet.