I think this highlights another issue with this: How many people even know that they can do this, something already implemented? Of the people that use FB, som

I think this highlights another issue with this: How many people even know that they can do this, something already implemented? Of the people that use FB, some percent won't even know that they can block ads from anyone, let alone political ones. Taking only the political ads into account, you then bifurcate the population into those that turn them off, and those that don't know to in the first place. We've been dealing (poorly) with these filter bubbles already, adding in more filtering may not be the solution here.