Read previewThe Instagram photos from Mark Zuckerberg's 40th birthday party left me with many questions. AdvertisementIn two of the photos, he's wearing a slightly different outfit: the gold chain is missing, and his T-shirt is plain black. AdvertisementOr, another option, which is my theory: He didn't choose the shirt; the shirt was gifted to him during the party. My theory is that this wasn't just her regular casual party attire — she was dressing up in a typical Mark outfit as a joke, chain and all. But I feel confident in my assessment that Zuckberg's outfit was gifted to him as a joke during his party.

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Persons: —, Mark Zuckerberg's, Zuck's, Priscilla Chan, Mark, Kieran, Zuckerberg, didn't, Cato —, Zuck, Priscilla Chan's Instagram, Mark doesn't, Bill Gates, Joel Kaplan, Meta's, Kaplan, Mark Zuckerberg Organizations: Service, Business, Google, Nike Locations: Harvard, Carthage