Don’t know about other people, but I usually avoid linking my accounts on various systems together.
Avoid using my account from one system as login to another system.
Almost always say “no” whenever one site asks if I want to cross link to my account on another site.
Almost never type my password for one site through another site.
(The “almost” qualifier because there actually are valid reasons, totally legitimate use cases to do otherwise.)
Yes. I like it better than the Tapatalk PM system, where the message history was very difficult to follow. The only downside of this system is that you can't have multiple concurrent but separate chats with the same person (or groups of persons). But then again, I assume there might be a plugin for that purpose.