If you go to https://www.facebook.com/settings?tab=applications you can see a list of everything you've signed up for using Facebook OAuth, then determine from there what sites you still use and adjust logins as necessary
Cryptocurrency has always been catching up rather than ahead of the game in the speculation stupidity arena. I always have a good time when I read /r/wallstreetbets (even though they're pretty self-aware, it can still be hilarious).
If they marked teaspoons instead of grams on the nutrition labels, I wonder how many people would be swayed away by that approach. That's a mind-boggling number.
Millennial male here (car insurers love taking my money), still use the same hotmail account that I made when I wanted to chat with my elementary school friends. I have two different gmail accounts, but I can't ever seem to make the switch over (I've tried multiple times). I think I'm the only person who uses gmail for spam accounts and hotmail as my real account.
Bitcoin is usually mined through mid-to-high end graphics cards. People running a pool of 6-7 of these cards per machine are seeing diminishing returns, so using a Pi wouldn't cover the electricity needed to keep it running.