Unlike conventional social media which encourages siloed talk within groups, VoH promotes talk between groups.

Don't mind the density but would like fewer self-aggrandizing appeals (heartfelt, heal, timely).

Two sentence gloss:

VoH makes order out of chaos by group crosstalk.  Unlike conventional social media which encourages siloed talk within groups, VoH promotes talk between groups.

Then give one sentence example

then explain VoH mechanism in one sentence.

after that para give greater detail for anyone still interested

My two sentence gloss surely could be improved, but it is short.  I don't know if it is worth emphasizing that conventional social media are designed to promote commerce whereas VoH probably not good for that by its very nature.