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Not Really Sure
I used to work at a company that blocks almost everything. Internet mail was blocked, social media was blocked. We had our own IM service so employees and clients could send/receive business related messaging. But I also worked in a place where they blocked almost nothing. Employee activity is monitored, I was tasked to occasionally have a look at the logs. Generally there was a bit of Facebook, but not excessive. With around 1,000 employees well under a hundred messages. But that was only through our network. I could see a number of people typing into their phones in the break room.