And it was also difficult to assure that different ads were shown equally

One example of this is split testing. Up until now, split testing on Facebook has been somewhat complicated. Yes, you could create multiple ad sets for different audiences or optimizations and show each the same ad creative. As mentioned above, it could be delivery and optimization (optimizing for Website Conversions vs.
_

Sammy:
I've never had a Mom and my Dad's parents died when he was 18 and his sister as well.
(20 December 2016)

Sammy:
We enjoy each other a lot but it is only us.
(20 December 2016)

Sammy:
It is cold and snowing usually where we live (Minnesota) so after church we sit by the fire.
(20 December 2016)

Hedwig:
She wishes we still had cable but we can't get it where we are.
(20 December 2016)

Hedwig:
We mostly get Disney channels but she doesn't like Disney.
(20 December 2016)

Hedwig:
She hates all these new shows she wishes they would put her favorite shows back on Nick Jr.
(20 December 2016)

Hedwig:
She thinks there's something wrong with our tv.
(20 December 2016)

Hedwig:
There showing all these new cartoons she don't like them or doesn't know what they are.
(20 December 2016)

Hedwig:
She's upset because they're also not showing much of her favorite Christmas shows this year.
(20 December 2016)

Hedwig:
We don't have a video store in town anymore so we can't rent it.
(20 December 2016)