Twitter is testing to a limited group on iOS the ability to add up to 140 seconds of voice in a tweet, with, currently, the ability for it to continue to a new audio tweet once the 140 seconds is reached. Once done, the tweet will show on your timeline. Any platform will play the audio.
Twitter4 says it plans to roll this out on iOS in the coming weeks, although there's no indication of when other platforms will gain this feature.
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blog.twitter.com...]