How can I filter people with Followers/Following ratio < 1 ?

That's a great question!

To do this create a new campaign or edit and existing one.  Then, checkout the Influence Ratio filter and set it to the range you would like.  

For setting it to <1 see the screenshot below. 



We will be adding a tooltip on Influence Ratio to make sure it is clear what that ratio is.  Thanks for the question!