[FabHK]

Facebook will still learn which websites you visit (provided they have the "like" widget) and what articles you read on the NYT, unless you use a good tracking blocker.

So, that's one downside, I think.

[mi100hael]

I run uBlock Origin everywhere and I rarely visit Facebook anymore. But when I do, I use a private window in a different browser.

[krrrh]

Additionally, on macOS you can use Fluid.app to create a Facebook-only browser with separate cookies, etc. Keeps it isolated from the general web. Do the same for google apps.