[Math Overflow](http://mathoverflow.net) has a cite button on answers, generating something like this:

    \bib{MO63167}{misc}{    
        title={Decomposing a discrete signal into a sum of rectangle functions},
        author={Gabriel (mathoverflow.net/users/13825)},
        note={URL: http://mathoverflow.net/questions/63167 (version: 2011-04-27)},
        eprint={http://mathoverflow.net/questions/63167},    
        organization={MathOverflow},
    }

Our version of that could be something like

    [1] [Unity keyboard/mouse shortcuts](http://askubuntu.com/questions/28086) —
    [Jorge Castro on Ask Ubuntu](http://askubuntu.com/users/235/).

<sub>[1] [Unity keyboard/mouse shortcuts](http://askubuntu.com/questions/28086) — [Jorge Castro on Ask Ubuntu](http://askubuntu.com/users/235/).</sub>

It's short and fulfills all four recommendations.

Optionally, one may want to include a date:

    [1] [Unity keyboard/mouse shortcuts](http://askubuntu.com/questions/28086) —
    [Jorge Castro on Ask Ubuntu](http://askubuntu.com/users/235/),
    retrieved [Apr 12 at 14:18](http://askubuntu.com/posts/28087/revisions).

<sub>[1] [Unity keyboard/mouse shortcuts](http://askubuntu.com/questions/28086) — [Jorge Castro on Ask Ubuntu](http://askubuntu.com/users/235/), retrieved [Apr 12 at 14:18](http://askubuntu.com/posts/28087/revisions).</sub>

We could either add a [cite] button to questions, like Math Overflow do, or (since that's a bit extreme in my view), have a topic on meta - "How do I cite content".

What do we think?