User to which I don't have access is showing as a link in my activity feed

A loggedin Fold user added Josh to a group.

While the user is scrubbed and there is no profilePath parameter for the user, the UI still shows as a link, and the link just goes to my own `/me` page (see bottom left status bar for the link target)

![screen shot 2014-05-29 at 9 44 51 am](https://cloud.githubusercontent.com/assets/102265/3118079/e5cf808e-e737-11e3-9b12-9340c673d011.png)

Note that the bug is **not** the fact that a loggedin user from another tenant is showing in my activity feed, that is expected because we use the public alias instead of the displayName. The bug is that the user's name is a link, whereas it should just be plain text with no profilePath.