Based on the search results, there are a few different possibilities for what the app "X" could refer to:
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Twitter: According to, Twitter was previously the owner of the Vine short video app and Periscope livestreaming service. While Periscope was discontinued in 2021, its core features are now incorporated into the Twitter app. Its possible that "X" is a new name for the Twitter app, as suggested by and. However, its worth noting that the Twitter app is still called "Twitter" on both the App Store and Google Play Store, as seen in and.
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Unknown app: describes an app called "X" that is a "trusted global digital town square" where users can post content, join public conversations, and create and join communities around various topics. Its unclear what this app is or who created it, as there is no mention of it in the other search results.
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Elon Musks "everything" app: and mention that Elon Musk has expressed a desire to create an "everything app" called "X" that would offer messaging, voice and video calls, social media posts, mini-programs, payment services, and more. However, its unclear if this app actually exists yet or if its still in development.
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Unknown app on your phone: suggests that some users may have an app called "X" on their phone that they dont remember installing. However, the article doesnt provide any information about what this app might be or where it came from.
Overall, without more information about what the app "X" specifically refers to, its difficult to provide a definitive answer.