Twitter-rival, a social media site launched on Sunday by Jason Miller, a senior adviser to former U.S. President Donald Trump, was briefly hacked, and more than 500,000 people have registered to use the site, Miller said.

The accounts of several well-known Republicans, including Miller, former Secretary of State Mike Pompeo, and Rep. Marjorie Taylor Greene had their pages’ header images replaced with the same message: “@JubaBaghdad was here 🙂 ^^ free Palestine ^^.” according to screenshots. Twitter user @JubaBaghdad told Insider it was easy to hack the pages and that he had done it “just for fun.” Most of the affected profiles appeared to be back to normal at the time of publication.

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Zachary Petrizzo, a writer for Salon, posted screenshots on Twitter of what the pages looked like:

Former Trump adviser Steve Bannon on Sunday described GETTR as “the Twitter killer” in a post on the new site.

Trump was permanently banned from Twitter and remains suspended by Facebook until at least 2023 and by Alphabet’s YouTube until the company determines the risk of violence has decreased.

Miller told Fox News earlier this week he hoped Trump would join but that the former president was considering a number of options. He said Trump was not funding the platform.

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