Search results should favor users/groups that the current user is following/followed

Seems like the search results should boost users and groups that the current user is following (or those that follow the current user). This would be especially helpful for the sharing auto-suggest, since users are likely to be following users with whom they wish to share content.

As a specific example, I'm following one user (Jonathan Whiting) on `oae.gatech.edu` and, not coincidentally, I expect to share a lot of content with him. When I want to share an item, however, just typing "Jonathan" in the auto-suggest isn't sufficient to load that user; instead, the auto-suggest items are "polluted" with dozens of other irrelevant (to me) "Jonathan"s from Marist.