It's probably because Facebook touches more people daily than "most of the companies"? (1.9 billions daily and 2.89 billions monthly according to their latest quaterly report[0], and that's for the Facebook website only, not the whole family products).

The website can also have an influence on many people lives since a lot of people use it as one of their main source of information etc.

[0] : https://s21.q4cdn.com/399680738/files/doc_financials/2021/q2...