I highly doubt that individuals at each company are actively manually deleting tweets or instagram posts.
More context: https://www.vice.com/en/article/qj8b4x/twitter-said-it-restr...
The censored tweets were _hand edited_.
https://www.wired.com/story/twitter-insiders-saudi-arabia-sp...
https://www.washingtonpost.com/national-security/former-twit...
To what extent, and if leadership knows and directs it are real questions.