“New platforms can be tools for connection with colleagues and outside experts, but can also serve as distractions while on the job”
The results of the Pew Research study really tell us that social media is like any other tool, and yes I called it a tool. You can use it to get information and learn things that help you do your job better, or grow your career, you can use it to keep in touch with people who are important to you, and you can also use it to watch cat videos and waste time in a myriad number of ways.
Just like the internet in general, the phone, television, and so on. Using social media during work time is probably a little of helping people do their job, and also a little of wasting time.
Try and control how employees use social media won’t change that, in fact, it might drive away the folks who do use it to grow their career, who choose to work somewhere that supports that.