Mastodon is Twitter's most high-profile recent rival. The Mastodon app is displayed here on a smartphone in 2022 in Berlin, Germany.
Mandatory Credit: Thomas Trutschel/Photothek/Getty Images
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Twitter is stumbling. Some ex-employees are launching rivals
After Sarah Oh lost her job as a human rights advisor at Twitter late last year in the first round of layoffs following Elon Musk's chaotic acquisition of the company, she decided to join a friend in building a rival service.
