Mark Zuckerberg not taking any chances sharing the ocean with sharks ... because he's hooked himself up to a contraption that supposedly keeps them at bay.
Mark was out on his hydrofoil surfboard in Kauai, Hawaii Thursday, wearing an ankle bracelet called Sharkbanz. The promise is that sharks don't like what it emits, so they stay clear of surfers. The device sends out an electrical current that apparently drives sharks away.
But, there are other, more subtle deterrents.