You can restrict the social profiles that a specific user is able to access. You do this by going to the top navigation and selecting "Workspace Users". Then, you're going to go to the actions dropdown next to the person that you want to restrict, click "Edit". Scroll to the bottom where it says "Restricted Social Profiles". This is where you can select the different social profiles that you want to be hidden from this person's view.
For example, if the CEO is using a Twitter account and only one person on the team is allowed to send to that particular Twitter account, you would probably want to hide or restrict this social profile from all of the other users. You can add as many profiles as you want here to be hidden, and when you're done, just click the "Save" button.