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Purchasing a book is one of the strongest self-selections of community, and damn it, I wanted to engage.

Mike Caulfield. (2021, March 10). One of the drivers of Twitter daily topics is that topics must be participatory to trend, which means one must be able to form a firm opinion on a given subject in the absence of previous knowledge. And, it turns out, this is a bit of a flaw. [Tweet]. @holden. https://twitter.com/holden/status/1369551099489779714

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Because social and interactive, collaborative annotation can make reading more engaging.

Sequencing calls to action from liking to commenting.

So social engagement increases brand loyalty.

Seems like that could be a key to Medium's success.

Awareness of a user's lifecycle from exploring to adoption to megauser is key.