"Twitter has updated its privacy policy, creating a two-lane service that treats US and non-US users differently. If you live in the US, your account is controlled by San Francisco-based Twitter Inc, but if you're elsewhere in the world (anywhere else) it's handled by Twitter International Company in Dublin, Ireland. The changes also affect Periscope."
Airlines, Air France, KLM, and Ryanair no longer offer customer service support using Twitter's direct message functionality.
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Elon Musk has recently declared that Twitter is going to roll out the latest changes to its user interface in order to give a better experience to users.