Hi,
When starting out my Facebook campaigns I am often confused about what is a good audience size? Facebook seems to say that the audience is defined when there are 5 million people in the audience and also when there are 500K people in the audience.
I have often seen better results after reducing the size of my audience but then the problem of scalability comes up.
So can anyone here help me understand what a good audience size is to test out different audience assumptions ?