When it comes to relationships with dot-com billionaires, pre-nups are becoming passe, and post-nups have become commonplace. The new trend in high-tech, high-net-worth relationships is what might be called "dating terms of engagement."

Mark Zuckerberg (Associated Press Photo)

According to a post on Valleywag, which quotes from a new book by Sarah Lacy, Facebook founder Mark Zuckerberg and his girlfriend, Priscilla Chan, held a "series of negotiations" to hammer out the terms of her move to Palo Alto. According to Ms. Lacy, the final contract included how often Ms. Chan would get to see Mr. Zuckerberg. It states:

"One date per week, a minimum of a hundred minutes of alone time, not in his apartment and definitely not at Facebook."

It's unclear what else was in the contract. But for future dot-com billionaire daters, I'd recommend a few additional terms.