I believe the term you're looking for is 'micronetwork'[0]. This is how Wickr gained use: a certain segment of the population found it very useful, even if it c

I believe the term you're looking for is 'micronetwork'[0]. This is how Wickr gained use: a certain segment of the population found it very useful, even if it couldn't be used for all their friends. Signal misses out on this by not offering anonymous user accounts, but otherwise they would have a very clear path to mass adoption. [0]: https://www.nickkolenda.com/pdf/viral-marketing.pdf https://www.nickkolenda.com/pdf/viral-marketing.pdf