His Latest Red Team BLues is a pretty good read, and its the start of a new set of books, so not a bad starting point

Probably. According to the Definitions in Art 4 of the GDPR an online identifier is personal data, I can't see why the right of erasure 17(1)(f) wouldn't apply as reddit is an information society service

Library thing deals with shelving information nicely, so its just more comfortable for physical books. I found it a bit less comfortable for ebooks, so used something else for that and now its habit

Bookwyrm & Librarything. I've never used goodreads and am a Long time Library thing user. I like Bookwyrm for tracking ebooks and tend to use Librarything for physical books, I also use a specific language bookwyrm for tracking 2nd language reading