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Completely depends on what kind of "communication" you're trying to promote. Twitter wanted people to send short, timely messages so they limited message length. How do you want people to use your service? Put constraints on your product to encourage that particular behavior.

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I am trying to influence intimate sharing behavior between exclusive groups, but I want them to be bite sized to be digest simply, promoting usage.

Assuming that they should be bite sized is a mistake, because the best "intimate sharing between exclusive groups" message might actually be long and detailed. Go look at how exclusive groups communicate now, and model your design to promote those qualities that you find. The problem is you're saying "I want them to be bite sized" not "exclusive groups tend to send bite sized communications."

Good point, I will do some further investigation :) I am trying to create a more exclusive groups product, but I want to keep information sharing to quick bite sized chunks. I guess that might not be a solution though.

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