Retargeting is an extremely divisive issue in digital marketing so here is the definitive guide to what you need to know  

We’re going to cover several very important topics 

1: How Facebook already does this for you even at Broad 

2: How this can hurt incremental lift 

3: The perspective on added cost and extended timeline of testing 

4: The impact of lower data volume in a greater number of places 

5: And some use cases where Retargeting can be extremely helpful