U.S. President Donald Trump has said that he will bar fast-growing social media app TikTok from the United States as American authorities have raised concerns the service could be a tool for Chinese intelligence.

Amazon, Apple, Google and Facebook are too powerful and will likely emerge from the coronavirus pandemic even stronger, the head of a U.S. congressional antitrust committee said Wednesday.

Leaders of the world's four most powerful companies will defend the Internet giants, painting them as US success stories in a fiercely competitive world during a major antitrust hearing Wednesday.

TikTok unveiled plans for a $200 million "creator fund" to add content from emerging social media personalities to the fast-growing video-sharing app.

Microsoft on Wednesday reported rising revenues in the past quarter amid strong demand for cloud computing services from pandemic-hit businesses and consumers and big gains in its Xbox gaming operations.

Twitter showed strong gains in its user base with more people turning to the short-message social network during the pandemic and civil unrest, according to a quarterly update Thursday that offered positive signs despite a big drop in ad revenues.

Pakistan has issued a final warning to Chinese-owned social media app TikTok to clamp down on what it called "immoral, obscene and vulgar" content on the video-sharing platform.

Facebook chief Mark Zuckerberg said in an interview published Monday he has "no deal of any kind" with President Donald Trump on content moderation on the social media giant.

Twitter says hackers "manipulated" some of its employees to access accounts in a high-profile attack on the social media company, including those of Democratic presidential challenger Joe Biden and tech entrepreneur Elon Musk.

Britain's cyber-security agency on Thursday accused a hacking group it said "almost certainly" operates as part of Russian intelligence services of trying to steal research into potential coronavirus vaccines.