How does each social networks regulate how employees use their platform?

Social networks are on the forefront of freedom of speech, but employees have contracts to represent the interest of the social network. How effectively employees market the social network can be essential to its growth. Plus, employees also have rare insights into how the platform functions, and that information could be used to build related products, invest in an insider trend, or at the very least, greatly impact the impressions upon content of interest. What rules and guidelines do companies such as Facebook, Twitter, Quora, LinkedIn & Medium instill on employees for using the social network that employs them?

Would be great to learn more. If you have experience or insight, please respond to this post, one the of the social network specific Quora questions embedded below, or DM me.

What rules and guidelines do employees of Twitter have for using Twitter?_Absolutely - more than a few times. Some things you do as a police officer are enjoyable almost to the point of glee…_www.quora.com

https://www.quora.com/unanswered/What-rules-and-guidelines-do-employees-of-Facebook-have-for-using-Facebook

What rules and guidelines do employees of Quora have for using Quora?_Mormont]: "... until Jaime Lannister put an end to the line of the Dragonkings." " King," croaked the raven. The bird…_www.quora.com

What rules and guidelines do employees of LinkedIn have for using LinkedIn?_Favourite Characters: (Micheal Scott) Michael's favorite catchphrase is "That's what she said!", he uses even in the…_www.quora.com

What rules and guidelines do employees of medium.com have for using medium.com?_We are getting a lot of these push poll questions about Hillary on Quora lately, this one is posted by someone who has…_www.quora.com