Last night, Apple briefly removed Telegram from the App Store because a single user had planted illegal pornographic content in a public group chat.

⬅️ Telegram was restored within hours. But I want to explain what happened — to warn other app developers and help protect online communities from similar attacks.

🧹Because Telegram quickly removes illegal content from public groups using all kinds of moderation tools, the attacker had to resort to a technical trick. He inserted AI-modified illegal content by editing an old message in an active group chat. As a result, the content was effectively hidden from the group’s members, preventing them from seeing and promptly reporting it.

💰 The attacker was a takedown extortionist: someone who demands ransom from group owners in exchange for not targeting their communities. These extortionists use automated accounts to plant illegal content in public groups and then report it directly to Apple, attempting to trigger the removal of legitimate communities whose owners refused to pay them.

🤝 From a practical standpoint, illegal pornographic content in Telegram’s public groups is not a systemic problem. Our moderation is effective. The fact that attackers must resort to backdated, effectively invisible content and other technical tricks proves this.

⚠️ However, there are two important lessons here for app developers and online communities:

— Extortionists have found a way to manipulate Apple into overreacting. Apple removed Telegram from the App Store before contacting us. This creates a potential systemic risk for every mobile app that hosts user-generated content. If an app used by more than a billion people can be removed from the App Store without prior warning, any app can be.

— The tactics used by takedown extortionists are evolving, putting communities across social platforms at risk. Telegram has extensive experience identifying the tricks used by coordinated reporting gangs and protecting legitimate communities (even when doing so risks our own app being temporarily removed from the App Store). Other platforms may not be equally prepared.

Stay vigilant! ☝️

🏆 The International Olympiad in AI finished yesterday in Astana.

🇷🇺 The Russian team took first place in the team competition, and Artem Gorokhov from my home city won the individual event. Well done! 💪

🇰🇿 I'm equally happy for the host country, Kazakhstan, whose Dauzhan Beketov took the second-highest individual score.👏

📩We're in touch with the organizers to deliver the winners' prizes from Telegram ($106,500+) securely next week.

Congratulations to all the winners! 🏆

🇺🇿 The 2026 International Olympiad in Informatics starts today in Tashkent.

🏆 The IOI is the ultimate coding competition for high-school students. Years ago, many members of the Telegram team won medals there.

🤝 To support the best young programmers in the world, Telegram will award the 235 winners exclusive digital collectibles — Algorithm Cups — worth at least $117,000 in total.

🕌 It’s fitting that IOI is hosted in Uzbekistan — the homeland of Al-Khwarizmi, the father of algebra whose name became the word “algorithm."

Let the best algorithm win! 💪

1️⃣3️⃣ Telegram turns 13 today.

For over half that time — the past 7,5 years — it's been one of the 10 most downloaded mobile apps in the world.

A whole generation has grown up with it 💪

🎂 Happy birthday, Telegram!

🏆 The International Olympiad in Informatics (IOI) ends today.

🇷🇺Students from Moscow and St. Petersburg won 2🥇gold and 2🥈silver medals — well done, Vladislav Zhiganov (#2 overall!), Maksim Kravchenko, Sergei Mukhanov and Vladimir Zvezdin!

🇺🇦Ukraine won 3 medals: 🥇 gold for Vladyslav Khalin, and 2🥈 silver for Illia Shevchenko and Daria Perekopska 💪

🇧🇾 Belarus took 1🥇gold and 1🥈silver, won by Kiryl Kardash and Fiodar Sashko, plus two bronze medals from their teammates.

🇰🇿Kazakhstan did well too, winning 1🥇gold and 3🥈silver medals to finish in the top five as a team, while Maksim Tsoy came #5 overall.

🇰🇬Kyrgyzstan picked up 2🥈 silver and 2🥉 bronze medals! 🤝

🇺🇿Uzbekistan, the host country, put on a great showing: 1🥈 silver for Jakhonali Khaydaraliyev and 3🥉bronze medals.

🇨🇳The strongest results of all, though, came from China 👏

At today's award ceremony, the IOI organizers are giving the 188 Algorithm Cups 🎁🎁🎁 to the winners. The organizers of the sister olympiad, IOAI, are sending the 220 Intelligence Cups 🏆🏆🏆 to their winners remotely.

These are the only digital collectibles Telegram has issued this year, so they could end up worth much more than the guaranteed $1,000 for gold.

We're proud to support the brightest young programmers of our time 🧠

💎 Telegram has applied for the .gram domain zone.

If the application is approved by ICANN, a billion Telegram users could get their own second-level domains.

🖥 For example, @durov would get durov.gram, and @monk would get monk.gram.

Users would be able to set up their interactive websites hosted by Telegram — just by typing one prompt ✨