Hello from London, where the mayor’s plans for cleaner air got a boost from the courts on Friday.

Greeks are voting in the first parliamentary election since their country’s economy ceased to be subject to strict supervision and control by international lenders who had provided bailout funds during its nearly decade-long financial crisis

By Howard Schneider WASHINGTON Federal Reserve officials, whose hike, skip or pause messaging on interest rates has become

TORONTO Greater Toronto Area (GTA) home prices fell in June, the first drop in five months, as the

By Katie Paul NEW YORK (Reuters) -Meta Platforms Inc started carrying out the last batch of a three-part round of

Nigerians are struggling with surging fuel prices after newly elected President Bola Tinubu declared an end to popular subsidies, a move analysts and...

Twitter has been plunged into chaos in recent days, amid new “rate limits” and rules that actually stop people from using the site. The changes have been dramatic enough that they have led to speculation that they could be the thing to finally doom Elon Musk’s takeover of the social network. What are the ‘rate limits’? It is a somewhat technical term for a complex process that has a simple effect: users are rationed on how many tweets they can see. If people and the apps they use make too many requests too often – in this case for tweets – then the service will stop providing them. On Twitter, the new rate limits are different depending on what kind of user is on: someone who pays for the premium “Twitter Blue” service will get more than a normal user, for instance. They are also changing all the time, with the limit being increased recently. Twitter has long had rate limits, which ensure that malicious actors cannot send huge number of requests to the site and bring it down, for instance. But they would previously only have been hit by people using specific tools, since they were much higher. What happens when you hit the limit? Users will see a warning telling them they have received the rate limit. The site will then stop working properly, because it will refuse to load any more tweets. Why has it happened? The official explanation is that Elon Musk is concerned about how many artificial intelligence companies are scraping posts from Twitter in order to feed to their systems and teach them more about how to use language. In an attempt to stop that, Mr Musk placed the limits to make it harder for that scraping to happen. But there is no proof that is actually the case. The problems at Twitter may well be infrastructural issues caused by the site’s engineering, and its lack of staff, that have made it incapable of serving normal requests. Or it might be a mix of the two. There is no doubt that the site is being scraped, but rate limits of this kind are an unusual way of responding to it, and other sites that are being scraped have not needed to do the same thing. Are there other changes? The other major change instituted recently by Elon Musk is to ban people who are not signed into the site from seeing posts. This is ostensibly for the same reason, since it means that scrapers cannot just gather up posts from the site from the outside. It already means that some things about Twitter are not working as they used to. If someone sends a tweet within a messaging app, for instance, then the posts’ preview won’t show, since the app cannot access the tweet. Will this change how people use Twitter? Almost certainly. Much of Twitter’s value lies in its high-profile and high-commitment users: the celebrities, organisations and big brands who use it to post, and the engaged users who follow them. That is much of what sustains its place in culture, even as it gets fewer users than much bigger social networks such as Facebook. The recent changes have directly antagonised those users. Big organisations cannot rely on tweets as a way for anyone to see what they’re posting, since users have to be logged in; engaged users cannot rely on being able to use the platform, since they are set to be rate limited. What’s more, the recent changes could cause problems for advertisers, given how important it is for users to stay engaged and see their posts. Companies are already using Twitter less for advertising, as a result of other controversies, and that may just continue. Is this the end? Some people have been predicting an end to Twitter since long before Elon Musk took it over; when he did, those predictions got louder and more regular, but they have still been largely wrong. It appears that no matter what Mr Musk does, people keep logging on and using the site. That might well be largely due to network effects: the idea that the value really comes from the number of people using the platform, which also makes it very difficult to create a new one. People might be unhappy on Twitter, but the network effect means they might feel lonely or that they are missing out if they move elsewhere. But all of that doesn’t mean that this time around won’t be the end. Certainly the latest problems have the most obviously problematic effect, of forcing Twitter’s most engaged users to not use the app, which might finally encourage them to go elsewhere. In the end, the discussion is often based on the idea that there will be some big moment that causes everyone to leave Twitter, or for the app to die. In fact, social networks have tended to decline slowly before they are finally shut down; something that might already be happening on Twitter. What are the alternatives to Twitter? Again, people have been trying to replace Twitter for years, for reasons including everything from protests against its content management rules to opposition to its centralised nature. Attempts to create a new Twitter have only increased since Elon Musk took over the original one. But they have almost always failed to take off. Network effects and the relative maturity of Twitter as a platform mean that they have always faced a challenge, and never really met it. As such there are a number of alternatives to Twitter. Notable among them are Mastodon, which is decentralised and has become perhaps the most discussed new alternative, and Bluesky, an effort to build a new kind of Twitter that originally began with the company. But the most promising alternative might be about to launch. Meta is launching Threads this week, an app linked to Instagram that aims to allow people to post text updates that might have the might to actually take over from Twitter. What is happening to TweetDeck? TweetDeck also went down along with Twitter over the weekend. It’s unclear how the two are connected, though they happened at the same time. Now Twitter has announced that TweetDeck is coming back. But it comes with some changes, and the most notable of them is that people will have to pay for Twitter Blue to get access to it. Read More Twitter to stop TweetDeck access for unverified users Meta’s Twitter alternative Threads to be launched this week How Elon Musk finally broke Twitter – and why it might just be the start Twitter rival Bluesky halts sign-ups after huge surge in demand Twitter is breaking more and more Twitter rival sees huge increase in users as Elon Musk ‘destroys his site’

The costs related to the East Palestine derailment continue to grow to reach $966 million for Norfolk Southern, but the railroad's service is improving and its insurance companies have started to pay their share of the cost of the crash in eastern Ohio early this year

For months, two giant hedge funds discussed a partnership that would be unprecedented for the industry. Schonfeld Strategic

Sign up for the India Edition newsletter by Menaka Doshi – an insider's guide to the emerging economic

Former President Donald Trump’s mounting legal woes are growing more expensive

Aston Martin Lagonda Global Holdings Plc raised £216 million ($277 million) by selling new shares as the British