Some of the weddings were elaborate; others were small backyard affairs.
Sometimes, their proposals are beautifully elaborate. Dave Morin, Co-creator of Facebook Platform and Facebook Connect, proposed in an air taxi above the Maldives.
The duo was inspired by their country western roots and got married in Jackson Hole, Wyoming. Guest were required to wear cowboy boots.
Mark Zuckerberg, by contrast, had a much smaller affair. Hardly anyone knew he was engaged. He gave his long-time girlfriend, Priscilla Chan, a self-designed ruby ring.
The day after Facebook went public, guests arrived at Zuckerberg's back yard. They thought they'd been invited to Chan's graduation party but found themselves at a wedding instead.
Chan walked down the aisle with their beloved dog, Beast. Chan wore a $4,700 off-the-rack dress from Claire Pettibone.
The Zuckerbergs honeymooned in Rome, Italy. They stayed in a five star hotel, Portrait Suites, and ate McDonald's.
When Facebook co-founder Chris Hughes got married to Sean Eldridge, he preferred a small wedding with about 75 guests, one being their dog.
The reception, on the other hand, was a blow out with 400 guests including Mark Zuckerberg, Nancy Pelosi, and Arianna Huffington.