Mark Zuckerberg had dropped out of schools some years ago, but that did not in any way stop the Jewish man from pursuing his purpose.

Facebook has become a global brand, connecting the world, enabling people find friends they had lost contact with and most of all offering people jobs.

On Thursday at Harvard University, he told a story many people never knew about him and how he pursued his dream and pushed it to where it is today.

He is, however, going back to the world class university to get his degree.

His story about his first day in class was an amazing one.

It was Computer Science 121 with Harry Lewis.

"I was late so I threw on a t-shirt and didn't realize until afterwards it was inside out and backwards with my tag sticking out the front. I couldn't figure out why no one would talk to me -- except one guy, KX Jin, he just went with it.

"We ended up doing our problem sets together, and now he runs a big part of Facebook. And that, Class of 2017, is why you should be nice to people," he told the gathering.

The Facebook founder also highlighted that his best memory from Harvard was meeting Priscilla, his wife.

Watch his speech that was largely centred around fulfilling purpose and how he had managed to carry on with Facebook even when the odds were against him.