I'm reading about Diceware and cryptography in general and I know how secure Diceware can be. I stumble upon this part on [The Intercept about Diceware](https://theintercept.com/2015/03/26/passphrases-can-memorize-attackers-cant-guess/) and it says:

> 
> "You don’t so much need them for logging into a website or something
> else on the internet. In those situations, you get less benefit from
> using a high-entropy passphrase. Attackers will never be able to guess
> a trillion times per second if each guess requires communicating with
> a server on the internet. In some cases, attackers will own or take
> over the remote server — in which case they can grab the passphrase as
> soon you log in and send it, regardless of how strong or weak it is
> cryptographically."
> 
> 
> 

So the question is, is it overkill to use Diceware on accounts like Facebook, Twitter, etc.? Should I rely on a password manager generating a random string of characters for these accounts and reserve my Diceware passphrase as a "master password" or a secret PGP key?