Hackers have infiltrated Asia's 7/11 convenience stores to display a message telling "warmonger" Nancy Pelosi to "get out" of Taiwan.
After US Speaker Pelosi landed in Taiwan last night, China displayed its wrath with a burst of military activity surrounding the self-ruled island, some of it falling within the country's 12-mile nautical border, defence analysts say.
One defence official branded it "amounting to a sea and air blockade of Taiwan".
Beijing also cut off several agricultural imports from the island, which is still closely linked financially to the mainland, and summoned the US ambassador.
Pelosi - who is the second most powerful lawmaker in Washington after President Joe Biden - arrived with a congressional delegation, defying China's repeated warnings and threats.
But the visit has sparked serious anti-Western sentiment in both China and Taiwan, where protesters gathered to demand the Speaker leaves and stamped on the American flag.
And it appears that cyber activists have made their opinion known by hacking into a nationwide convenience store chain and brandishing chilling threats on their screens.
Monitors in 7/11 stores up and down Taiwan displayed the message "Warmonger Pelosi, get out of Taiwan" today.
After meeting with Taiwan's president Tsai Ing-wen, who Beijing suspects of pushing for formal independence, Pelosi reaffirmed Washington's stance on the US ties to the island.
"Our delegation came to Taiwan to make unequivocally clear that we will not abandon Taiwan,'' Pelosi said.
"Now, more than ever, America's solidarity with Taiwan is crucial, and that's the message we are bringing here, today."
A long-time China critic, especially on human rights, Pelosi met with a former Tiananmen activist, a Hong Kong bookseller who had been detained by China, and a Taiwanese activist recently released by China.
Fury on the mainland over the 82-year-old Democrat's defiance of Beijing was evident all over Chinese social media, with one blogger railing: "this old she-devil, she actually dares to come!"
The last U.S. house speaker to go to Taiwan was Newt Gingrich, in 1997. But Pelosi's visit comes amid sharply deteriorating Sino-U.S. relations, and during the past quarter century China has emerged as a far more powerful economic, military and geopolitical force.
China considers Taiwan part of its territory and has never renounced using force to bring it under its control. The United States warned China against using the visit as a pretext for military action against Taiwan.
In retaliation, China's customs department announced a suspension of imports of citrus fruits, chilled white striped hairtail and frozen horse mackerel from Taiwan, while its commerce ministry banned export of natural sand to Taiwan.
While there was little sign of protest against U.S. targets or consumer goods, there was a significant police presence outside the U.S. consulate in Shanghai and what appeared to be more security than usual outside the embassy in Beijing.
