Imagine owning a social network with billions of users but being unable to block its founder. For years, that was reality on Facebook—users who tried to block Mark Zuckerberg got an error message: "This profile can't be blocked for now." The same applied to his wife, Priscilla Chan.

When users discovered this in 2017, it sparked immediate backlash. Was Zuckerberg above his own platform's rules? The optics looked terrible: the CEO of a company facing privacy scandals couldn't be blocked by the people whose data he controlled.

Facebook's Explanation: Anti-Spam Gone Wrong

Facebook's explanation was technical, not authoritarian. According to company spokespeople, the restriction wasn't specific to Zuckerberg—it was an automated anti-spam measure that kicked in when any account received an unusually high number of block attempts in a short period.

The system was designed to combat viral blocking campaigns, where groups of users would coordinate to mass-block someone as harassment or protest. When the threshold was hit, the platform temporarily prevented further blocks to protect the targeted account.

Zuckerberg and Chan simply triggered this protection because so many people tried to block them. In a platform with billions of users, even a tiny percentage trying to block the CEO adds up fast.

The Timeline

2010: The anti-spam blocking system was implemented
2017: Media outlets and users noticed Zuckerberg couldn't be blocked
September 2017: Facebook acknowledged the issue and promised a fix
Current status (2025): Unknown whether the restriction was ever lifted

Why It Mattered

The controversy highlighted a broader issue: automated systems often produce unintended consequences. A feature meant to protect harassment victims ended up protecting one of the world's most powerful tech executives from users who simply didn't want to see his posts.

Facebook told BuzzFeed News that a fix would roll out eventually, but the technical challenge would take time. Whether that ever happened remains unclear—the story faded from headlines without confirmation of a resolution.

Users did have one alternative: unfollowing Zuckerberg's account. This hid his posts from their feeds without blocking him entirely. Not quite the same level of control, but better than nothing for those who wanted distance from Facebook's founder on his own platform.

Related Tags