I remember being in 20 years old, at the start of my career, and complete broke. I thought Twitter was just a toy website, until one day I radically changed my mind.

I was a customer of a bank that treated me with nothing but contempt. Whenever I called the bank because of a problem, I would stay on the line forever to eventually talk to an unbothered representative. One day, instead of calling, I complained on twitter and tagged the bank. Half an hour later the bank apologised and fixed my problem.