Buyer persona essentials: My top tips & examples to inspire yours

As I was scrolling on Facebook today, I noticed two ads. One was offering me 20% off at a store that I’ve never heard of before. It felt completely random, in a “did you send this message to the right person?” kind of way.
The definition of a buyer persona [in under 100 words]

Marketing is a paradoxical undertaking: We create campaigns for the masses, but those messages are only ever experienced on the individual level. How does a good marketer straddle this? By writing directly to a single viewer, aka their buyer persona.