Your "attributes" chart is interesting but leaves out a critical aspect of communications; accuracy. To survive peer review, communications research must include some sort of measure of the likilihood of message receivers perceiving the sdame message the transmitter intended to communicate. A misunderstood message is potentially much worse than no message at all. Academic research often measures this as a channel's messsge "ambiguity". with face-to-face having the least ambiguity because of its richness of clarifying clues in addition to just the words spoken (voice inflection, facial expression, body lauguage, etc.). Live audio-visual is the secod least ambiguous, telephone is second, and email (and all your highly touted social media channels) are the most likely to be mis-interpreted.
It is also useful to note that many of the advantages you correctly site about social media also apply to the original "social medium" - the watercooler or break room -- and the number of people fired for spending too much time "collaborating" there.
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