Twitter blocks animated PNGs, saying a bug had allowed them, and that they did not respect autoplay settings so could be used to harm people sensitive to motion
Twitter will no longer animate PNG files after trolls hijacked the Epilepsy Foundation's handle and hashtags last month …
Context & Ripple Effects
This fix lands days after the Epilepsy Foundation filed a criminal complaint against 30+ unidentified users who flooded its handle and hashtags with seizure-inducing videos last month. Twitter's framing is technical rather than moral: a bug had let animated PNGs bypass autoplay settings entirely, so the format itself became an attack vector against photosensitive users.
It also fits an older pattern in Twitter's moderation history — the platform previously killed embedded MS-DOS games in tweets, another case of removing a whole media type when it enabled abuse — and foreshadows the 2021 ban on sharing private images without consent, where Twitter again moved from policing individual posts to restricting categories of media outright.
First-order effects
- Users posting animated PNGs lose animation on Twitter immediately, while people sensitive to motion get autoplay settings that actually hold for every image format.
Second-order effects
- Trolls lose their cheapest seizure-inducing vector, pushing coordinated attackers toward other formats — and raising the cost of the kind of campaign behind the Epilepsy Foundation's criminal complaint.
Third-order effects
- If the pattern holds, platforms will treat media-format audits as core safety infrastructure rather than reactive fixes, with liability pressure from victims' groups like the Epilepsy Foundation shaping what formats ship at all.
The trend: Social platforms are shifting from moderating individual posts to disabling entire media formats whenever a format becomes an accessible attack vector.