2016—personalized 99% of users' feeds by displaying Tweets—even older Tweets and Retweets from accounts the user had not directly followed—but that the algorithm had "deemed relevant" to the users' past preferences. Twitter randomly chose 1% of users whose Home timelines displayed content in reverse-chronological order from users they directly followed. Mobile Twitter has mobile apps for iPhone, iPad, and Android. In April 2017, Twitter introduced Twitter Lite, a progressive web app designed for regions with unreliable and slow Internet connections, with a size of less than one megabyte, designed for devices with limited storage capacity. Adding and following content There are numerous tools for adding content, monitoring content and conversations including Twitter's own TweetDeck, Salesforce.com, HootSuite, and Twitterfeed.com. , fewer than half of tweets posted were posted using the web user interface with most users using third-party applications (based on an analysis of 500 million tweets by Sysomos). Twitter Blue On June 3, 2021, Twitter announced a paid subscription service known as Twitter Blue, which provides additional premium features to the service, which currently include: Undo Tweet, which delays the posting of a tweet by up to one minute to allow the submitter to withdraw it before it is posted. Bookmarks, which allows users to save individual tweets into folders. Reader mode, which converts threads of tweets into an article-like view. A selection of color themes and app icons for the Twitter mobile app. Dedicated customer support. NFT profile pictures, added on January 20, 2022. They are displayed in a hexagon-shaped frame, rather than circular like other profile pictures. A planned edit feature for tweets was in development as of April 2022. Customization of the navigation bar. Tweets up to 4,000 characters in length, as of February 8, 2023. Verification of paid accounts In November 2022, Musk announced plans to add account verification and the ability to upload longer audio and video to Twitter Blue. A previous perk offering advertising-free news articles from participating publishers was dropped, but Musk stated that Twitter did want to work with publishers on a similar "paywall bypass" perk. Musk had pushed for a more expensive version of Twitter Blue following his takeover, arguing that it would be needed to offset a decline in advertising revenue. The verification marker was included in a premium tier of Twitter Blue introduced on November 9, 2022, priced at US$7.99. On November 11, 2022, after the introduction of this