Bluesky outage: Why it happened

Bluesky, the social media app popular with X expatriates, suffered a widespread outage on Thursday, April 16.

And in a thread posted on the official Bluesky profile, the app's leaders revealed the cause of the outage — a distributed denial-of-service (DDoS) attack.

"Our team received a report of intermittent app outages at about 11:40pm PDT on April 15, 2026," the post read. "They worked through the night to mitigate a sophisticated Distributed Denial-of-Service (DDoS) attack, which intensified throughout the day."

Fortunately, Bluesky also said there was no evidence that any user data had been compromised in the attack, which affected the Bluesky app, feeds, notifications, and search. The company said it would provide further information by 1 p.m. ET Friday.

The Bluesky status page indicated the app was fully online as of this writing; the app reports a 99.983 percent uptime over the past 90 days.

A DDoS attack is relatively simple and low-effort for cybercriminals. In this type of attack, hackers send a massive number of requests to overwhelm servers. DDoS attacks have been around since the early days of the World Wide Web, and as the Bluesky outage shows, they can still cause problems.

The Bluesky outage began affecting users in the early morning hours, with the service DownDetector recording thousands of user error reports. (Disclosure: DownDetector and Mashable are both owned by the same parent company, Ziff Davis.)

Bluesky saw massive growth after Elon Musk took over Twitter, and again following the second election of President Donald Trump. However, its growth has stalled more recently, and data shows that daily active users on Bluesky have declined.

Mashable reached out to Bluesky with questions about the attack, and we'll update this story if we receive a response.