Automatically reorder share list based on usage.

[wting]

It'd be awesome if the share list was reordered based on last recently used (e.g. like Gallery sharing).

I never use Messing to share articles, but I use Google+ and Pocket pretty often. I'm sure this differs from person to person so it'd be nice if the list automatically rearranged itself.

[pkillian]

Already got an idea for how to incorporate this; will look into it tonight or over the weekend.