Zuckerberg is quite active on Facebook and keeps posting photos from his office, with his wife Priscilla Chan, daughter Maxima and the cotton ball pet, Beast, who also has a Facebook page with millions of followers.
Take a look:
A photo of Mark from his school days, a high school classic.
A photo of Mark when he started his quest to make the world more open and connected.
Mark and Priscilla in a photo from 2005.
When Beast was just a little ball of fur.
"We're so happy to welcome our daughter Max into this world. Everyone is happy and healthy. Thank you for all your love and support through our pregnancy. There is so much joy in our little family," Mark wrote in a Facebook post.
Last, but not the least, here's Beast.