Show the email address, you shared a link with

Hey,
when i share a link and send it to a mail address, i don't see in my activity with who i shared this link.
![activity](https://cloud.githubusercontent.com/assets/7849016/4882629/a8896436-6358-11e4-9c4d-79c4994188b0.jpg)
Can you may implement this or is there already a way to customize this?