When you open your user profile or the profile of another user you can review Recent Activity and Top Contacts.
I searched for information how Top Contacts and Recent Activity are generated and found no references in the documentation, but a couple of responses in the Jive community:
It's not that I currently have any problem and you may look at your own user profile to check for yourself, but I would generally prefer not to show such information.
Unfortunately, this cannot be configured in the privacy settings. My suggestion is to disable this information if possible and press the software developers to make this an option that the user can customize in the privacy settings.