You can easily implement ads between the posts in your Social UX layout.
First, go to the Layout & Design tool in the left nav.
Once there, for example, let's take a look at the Home Page' Social UX set up:
This is how it will look at first if it has no ads whatsoever.
If you select the first Post element on this list, go ahead and click on '+ ADD ELEMENT' on the top left corner.
It will open up a menu with all the elements you can add. Choose 'Ad Tag'.
The new Ad Tag will be positioned at the end of the list of elements, but you can easily move it to the top with drag and drop.
After drag and drop:
You can also easily copy this Ad Tag you implemented, or the Post that you have in the list with the COPY button that's on the top center:
You will then have to click on PASTE right next to it, and the copy of the element will be placed right above the one you copied initially:
With the copy & paste tools as well as the Ad Tag element, you can easily monetize the stream created within the Social UX layout.