Great post !
So what you check is the number of high REP followers an account have to determine legitimacy?
So let's say an account follows 2000 accounts and is followed by 1000 and in that 1000 none are highREP, you would classify it as spam?
Just curious :)
No, the follower graph includes all Steem users, minus bots / spam accounts. They can just be ignored from the follower graph.
That might be hard to scale no?
Nope, works on a Commodore 64 if needed. I updated my post above now including the "follower matrix", and a short explanation regarding multi-iterative substitutions (solving many simple equations) vs Gauss-Jordan / Gaussian matrices row reduction (which would be the de-facto solution, but extremely heavy on RAM).