Graber was referring to the way millions of users left Twitter, now X, after Musk purchased the company in 2022. Bluesky now has over 21 million users, still dwarfed by X and Threads, which Facebook's parent debuted in July 2023.
X and Meta didn't immediately respond to requests for comment.
Threads has roughly 275 million monthly users, Meta CEO Mark Zuckerberg said in October. Although Musk said in May that X has 600 million monthly users, market intelligence firm Sensor Tower estimates 318 million monthly users as of October.