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It's a matter of work ethics
I think if there is a problem, it's not the company, it's the employee. Employees need to be mature enough to understand that they need to work and do their job. Companies need to treat employees with respect and not treat them like little boys that need boundaries. My company doesn't block these apps, only some streaming (youtube, probably to avoid slowing the network) and obviously downloading content to protect customer data. If the job is done and deadlines are met, they can't care less. If the employee is irresponsible, they deal with him and don't penalize everybody else for his actions (or lack of work ethics).