Use work computers/devices for work. If you do anything else on them, keep it to things that you would be comfortable defending while having them shown to all of the management of your company on a big screen. Nothing you do on a work computer is private from your employer or the workstation support people in IT.
If you want to access anything else while you are at work, use your personal (not company supplied) phone, and if you really want that to be private, be using your data connection and not connected to the company LAN.
What all of that means is, most of your time when you are at work really ought to be spent working. Failing that, at least stick to reading news (from relatively mainstream sites) or things at least vaguely related to your job or things that you are very confident are ok within your company culture. (For example, at some companies it might be perfectly normal to stream an NCAA basketball game, at others that might be a firing offense, at many between it might not get you fired but might hurt your reputation.)
I hate open plan offices by the way, but the people who support them will justify it partially because they are trying to get employees to spend more time working.
If you want to access anything else while you are at work, use your personal (not company supplied) phone, and if you really want that to be private, be using your data connection and not connected to the company LAN.
What all of that means is, most of your time when you are at work really ought to be spent working. Failing that, at least stick to reading news (from relatively mainstream sites) or things at least vaguely related to your job or things that you are very confident are ok within your company culture. (For example, at some companies it might be perfectly normal to stream an NCAA basketball game, at others that might be a firing offense, at many between it might not get you fired but might hurt your reputation.)
I hate open plan offices by the way, but the people who support them will justify it partially because they are trying to get employees to spend more time working.