What makes you start following someone?

I've been reading more on consumer psychology and got fascinated by this subject. There's a ton of research on "people providing value, they're charismatic, blah blah" but I want to know more from human beings, not just books.

Correct me if I'm wrong.

The process is typically this:

• You notice someone posting great content (on a blog, in comments, in FB groups, on here, on Linkedin, Twitter, Reddit, Quora, etc, or you see their content popping up in search results whenever you search for the keywords you've been looking for.)
• You have now seen them consistently post stuff that makes you think, "huh, so true, I'ma try that".
• You hit that follow button, subscribe, etc, and you keep seeing that content

What's your take?

For me personally, I've realized I started to follow people because...
a) we have similar mindsets and therefore will probably think in similar ways
b) they challenge my thoughts because they provide me with new things to think about and implement
c) I might want to buy from them if what they offer is at least 80% of what I need.