"Vous" is the first one that comes to mind in french. But since it is also a more formal (and/or "respectful") version of "tu/toi", it can both designate a group of people or a single person, depending on the context (just like "you" in English). Sometimes people will use "vous tous" (literally "you all") to make this clear.
It is a little better than the "you" situation in English since if you are speaking with someone that is not using the singular form of "vous" to speak about you (which is basically anyone you are familiar with unless they are your boss or In-laws and kind of oldschool), it is instantly clear what they mean at least.
I feel like with Facebook it's more of a YouTube situation where they don't care as long as it makes them money and no major regulator raises their eyebrows. Which is despicable, don't get me wrong, but Twitter is not just doing that, it is actively endorsing these mfs