How many other sites let you be logged into multiple accounts concurrently in the same browser session? Does Facebook? Microsoft? Amazon? (I genuinely haven't t

How many other sites let you be logged into multiple accounts concurrently in the same browser session? Does Facebook? Microsoft? Amazon? (I genuinely haven't tried it). That said, there's a lot that could be done to make multiple accounts easier to use. Personally, I use multiple Chrome profiles with one account per, just to minimize the "surprise" (and to keep, e.g., my corp account separate from my personal ones).