Twitter

In a statement, the company said "We're aware that Twitter is being restricted for some people in Russia and are working to keep our services safe and accessible".

On Friday Russia restricted Facebook after a clash over "censorship".

Russia's communications regulator Roskomnadzor accused Facebook of violating "the rights and freedoms of Russian citizens".

Facebook said it had refused to stop fact-checking and labelling content from state-owned news organisations.

This will come as a big surprise to many Nigerians, who had assumed that the Nigerian government had backed down following months of negotiations, says the BBC's Nduka Orjinmo in Abuja.

Nigeria suspended the social media firm last June after it deleted a tweet by President Muhammadu Buhari.

It accused Twitter of siding with secessionists.

Before ending the ban, the Nigerian government insisted that Twitter:

Register in Nigeria

Appoint a designated country representative

Comply with tax obligations in Nigeria

The new rule is an extension of policies to prohibit "doxxing" - the publishing of private information such as home addresses, without consent.

Critics say the rule is too broad and could be "used to deliberately stifle free expression on the platform".

But Twitter said it would consider the context in which images were posted.

He will be replaced by the current chief technical officer, Parag Agrawal, Twitter said.

Mr Dorsey, who co-founded Twitter in 2006, has been serving as chief executive of both Twitter and payment firm Square.

"It's finally time for me to leave" he wrote in a statement, saying the company was "ready to move on."

Mr Dorsey said he had "deep" trust in his replacement. "I'm deeply grateful for his skill, heart, and soul. It's his time to lead," he said.

Mr Agrawal joined Twitter in 2011, and has been the firm's head of technology since 2017.

Now, when users share an Instagram link on Twitter, a small preview of the post will be displayed.

Instagram controversially removed the feature shortly after being acquired by Facebook in 2012.

Twitter card previews started for some users on Wednesday and will eventually be available to everyone. Instagram and Twitter are both promoting the change.

The new feature will expand visual media embedded in tweets to fill the whole width of a mobile phone's screen.

Currently, images are indented next to a user's profile photo and take up much less screen space.

Twitter said the new layout - being tested on iOS but not Android - would give media "more room to shine".

The experimental changes to fuel content creation and consumption come amid a rollout of Twitter's subscription service for dedicated users, Twitter Blue.

The news agencies will help Twitter give more context and background information on events which create a high volume of tweets.

Twitter hopes this will counteract the spread of misleading information.

There has been renewed pressure to remove false content from the platform.

Twitter said the partnership will enable it to ensure accurate and credible information is rapidly available "when facts are in dispute".

The Campaign Against Anti-Semitism says Twitter's policies on hateful material are "failing".

Out of about 1,000 anti-Semitic tweets it reported, Twitter found only about 40% breached its policies, it said.

According to Twitter, anti-Semitism breaks its rules and is not permitted on the platform.

This is not the first time Twitter has been accused of being too slow to remove anti-Semitic posts.

The class action lawsuit also targets the three companies' CEOs.

Mr Trump was suspended from his social accounts in January over public safety concerns in the wake of the Capitol riots, led by his supporters.

On Wednesday, Mr Trump called the lawsuit "a very beautiful development for our freedom of speech".

In a news conference from his golf resort in Bedminster, New Jersey, Mr Trump railed against social media companies and Democrats, who he accused of espousing misinformation.

He was barred indefinitely from both sites in January in the wake of posts he made on the US Capitol riots, but last month Facebook's Oversight Board criticised the open-ended penalty.

Facebook said Mr Trump's actions were "a severe violation of our rules".

Mr Trump said the move was "an insult" to the millions who voted for him in last year's presidential election.

Facebook's move comes as the social media giant is also ending a policy shielding politicians from some content moderation rules.