This is an extremely interesting view on paid advertising, especially from my experience and expertise when it comes to buying ALOT ad space with Facebook. Over the last 2 years I have spent over $800,000 USD advertising my products and sales funnels with Facebook.
Early on in my experience we would spend $2000-$5000 a day with FB, which yielded insane conversions. During the Holiday's we would rattle off $20,000-$30,000/day on our e-commerce stores selling various items of apparel.
Now, 2 years later those kind of conversions are unheard of. Facebook has drastically changed becoming extremely more competitive. Lead generation and conversion costs can get very high if you haven't adapted.
Awesome article, i would love to indulge more into this topic specifically with Facebook & Instagram
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