+Since 2017, the relationship between Mastodon and Twitter has exhibited a complete role reversal in key feature additions. While almost all of the articles and essays on the subject are keen to point out that [Eugen Rochko modeled Tootsuite’s original UI after Tweetdeck](https://mashable.com/2017/04/06/eugen-rochko-mastodon-interview/) (now an optional selection called “Advanced UI,”) the “mimicry” between the donor-funded, Open Source platform headed by a single German developer in his twenties and the 15-year-old for-profit social network maintained by a company with nearly 5000 employees shifts in the other direction upon close examination of specific featuresets. Just five months after Mastodon’s first penetration of the mainstream tech conversation in April of 2017 – with its default 500-character post limit and support for up to 5000 – Twitter [announced its upcoming expansion from 140 to 280 characters](https://blog.twitter.com/en_us/topics/product/2017/Giving-you-more-characters-to-express-yourself.html). In October, 2017, with [Mastodon’s second version release](https://blog.joinmastodon.org/2017/10/mastodon-2.0/), support for image descriptions (alt text) for the sake of accessibility was introduced. While Twitter had long supported similar metadata in images, it did not do so on its main web interface (twitter.com,) Tweetdeck, nor its mobile apps until [May 27th of this year](https://twitter.com/TwitterA11y/status/1265689579371323392).
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