It's not strictly twitter. They are the push notifications of twitter, using the mobile web site (so, finally, the web browser notifications). It's 100% a sony issue for the old telephone I had worked flawlessy with such notifications. EDIT: it's no only twitter. It's every notification via web browser. I tried enabling push notifications in a different website (i.e. weather ilmeteo.net) and at the first notification the phone crashed forcing a reboot.
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