Blocking users from posting to Twitter, but allowing viewing of


I work in a financial firm that is worried about compliance. They are currently blocking all access to Twitter, but would like to life restrictions so that users can access everything on, but not be able to post and tweets. I’m trying to do this through firewall policies and was wondering if there is any URL, object, or some type of identifier that I can block in that would prevent it from allowing users to post tweets?