What a Joker.

New photos show Facebook honcho Mark Zuckerberg zipping around on an electric surfboard in Hawaii — while wearing enough white sunscreen on his face to make the Batman super villain blush.

The 36-year-old billionaire — who was recently accused of colonizing the island of Kauai — was caught in the geeky moment while his security detail followed behind him on a boat on Saturday, according to Mega Agency photos.

In the snaps, Zuckerberg is shown hanging 10 on the $12,000 Efoil board, which allows users to glide above the water, alongside pro surfer surfer Kai Lenny, according to the Mega Agency.

A tan and toned Lenny went shirtless — and did not appear to apply sunscreen with the same zeal as Zuck.

But Zuck is shown rocking a less-than-gnarly soaked blue hoodie and shorts as he cruises along the mouthwash-blue ocean.

Earlier this month, native Hawaiian Mia Brier launched a campaign to stop Zuckerberg from snapping up land on the island — calling him “greedy” for suing locals who own property close to his massive $100 million estate.

“Mark Zuckerberg is the sixth richest man in the world… and he is suing Native Hawaiians in Kauai for their land so he can build a mansion,” she wrote in a change.org petition.