Limiting your users to a handful of URL's will just create an administrative headache, as you'll get bombarded with requests for allowing URL's.
Best to look into purchasing some kind of URL filtering solution to run on the network, where you can block URL's by category. Either some cloud-based solution or a hardware appliance.
Best to look into purchasing some kind of URL filtering solution to run on the network, where you can block URL's by category. Either some cloud-based solution or a hardware appliance.