User cannot see "Links" button

Tagged:  

I'm having an issue with users not being able to see the "Links" button. They can add links and view them when clicking it from the events time line. Admins can see the button fine. I've tried two seperate installs and the same thing happens so I'm assuming this is pretty common or even intended but I haven't been able to find anything searching for a solution. Any help would be appreciated.