Clockwise from above left, Sean Parker and Alexandra Lenas, who will marry next week in what is said to be an extravagant event; Mark Zuckerberg and his college sweetheart, Priscilla Chan, in the backyard of their home in Palo Alto, Calif., where they were wed; and Sergey Brin and Anne Wojcicki had a casual wedding on an island in the Bahamas.
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