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In a blog post today, Twitter has announced that they will be “experimenting with a way to make ads on Twitter more useful to our users in the United States by displaying promoted content from brands and businesses they’ve shown interest in. Users won’t see more ads on Twitter, but they may see better ones.”
Here’s how to turn this off. Log in to your account and head for Settings. Uncheck “Personalization” and “Promoted content” and click Save changes.