Remove unnecessary white space on posts on mobile

When a post is made on heartbeat it's done in two columns. The left small column just has the users avatar in it. The user's name and underneath it the post is in the right hand column.
That means there's a column of white space running down the left of any post. On mobile it uses up quite a bit of scarce screen real estate that could be used for the post itself.
My suggestion is to do the same as Facebook and pretty much every other social network and have two columns for the post header with the avatar and post title or user name - but then to put the post itself in a single full width column underneath.