In this week’s Failure Friday segment, we hear from the founder of Birthday Buddy, an app that sends automated birthday wishes to Facebook contacts. His free service ran into problems, but he regrouped to improve the app AND turn it into a moneymaker.

Side Hustle School features a new episode EVERY DAY, featuring detailed case studies of people who earn extra money without quitting their job. This year, the show includes free guided lessons and listener Q&A several days each week.

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