The social network Facebook has launched a new long-awaited feature.

The most popular social network in the world after many other instant messengers has been able to delete already sent messages. The function is currently being tested and available only to some users, but will soon become available to everyone.

Unlike some messengers, messages on Facebook can be deleted only for a certain period, and not at any time. After deleting the message, Facebook will save it for some time to verify that no complaints have been received.

13 years ago, on July 15, 2006, Twitter was launched, which has now become one of the largest platforms in the world of social networks.

Twitter – The social network, with microblogging network, allows users to send short text messages (up to 280 characters) using SMS, instant messaging and third-party client applications.

In 2010, Twitter Inc accounted for $ 45 million (from sales of online advertising).

The report of the Spanish Center for Globalization and the Business School Strategy IESE has named the five most intelligent cities in the world.

The analysis was based on nine criterias: human capital (development, involvement and upbringing of talent), social cohesion (consensus among different social groups of the population), economy, environment, management, urban planning, international relations, technology, mobility and transport (ease of movement).

In total, IESE Cities in Motion Index 2019 hit 174 cities from 80 countries. The first five cities were London, New York, Amsterdam, Paris and Reykjavik.

“A truly intelligent city is intended to improve the quality of life of its inhabitants, which means providing economic, social and environmental sustainability,” said Joan Enric Richart, professor at IESE and co-author of the report.

In Telegram appeared a book exchange service between Ukrainian readers – Bookcrossing.

The service consists of a channel that contains a catalog of books, and a bot that accepts books from a photo. Now in the service there are more than 1000 subscribers, as well as many books of Russian and Ukrainian publishing houses, in particular, even recently published books.

The books that are currently looking for a new owner are published under the hashtag #bookcrossing_free. If you like the book, you can go directly to the owner and decide how to pick it up.

You can also borrow a book for temporal reading using the hashtag #bookcrossing_name.

Google avowed that listening user’s voice commands.

The company’s specialists listen voice commands that users give to the Google Home Smartphone or Google Assistant.

At the same time, the company gives a small part (0.2% of recorded teams) to the linguistic experts. The corporation is doing this in order to better understand the different languages ​​and further improve the technology of speech recognition, said manager of the company David Monsys.

The specialist emphasized that the transmitted records are not related to user accounts, and experts are not allowed to decipher the background conversations.

The functioning of the Bitcoin network and their mining use as much electricity as the whole Switzerland.

This shows the new program at the University of Cambridge. The tool shows how much energy a cryptocurrency network uses compared with other industries and countries. Now the program estimates that Bitcoin uses about seven gigawatts of electricity, equal to 0.21% of world electricity production.

To generate so much energy, you need seven medium-sized nuclear power plants at once. During the year, this is as much in energy consumption as in the whole of Switzerland.

“Using this comparison, we plan to communicate our idea more effectively,” said program co-founder Michel Rauchs.

Thanks to the Translaty Pocket Translator, you can instantly speak and understand 39 languages ​​without any prior knowledge.

Established in Japan TRANSLATY has become an excellent solution for translation anywhere. Translaty uses advanced voice recognition technologies and can accurately understand and translate 39 different languages. The translator is designed for travel and can easily fit in your pocket.

All you have to do is select your language and language you want and click on the translation key. You will write the answer yourself by clicking the Translaty button and the device will immediately translate your language and clearly say in the translated language.

Studio Bagaar has created a site that is simply impossible to use.

The idea of a site represented as an interactive game is to completely confuse the user. All elements, including buttons and navigation, are made in a state of prevailing habits and rules.

“Over the past ten years, we have become accustomed to certain design patterns. Users act intuitively, perceiving 90% of the interface as a matter of course. But what happens if everything is mixed well? What if we get away from the established rules and do the opposite? “- say developers.

The world’s first liner, which partially feeds battery packs, will go on an ecological cruise fron Norway.

The vessel can take on board five hundred passengers. The ship is specially built for survival in harsh climatic conditions. In particular – for a trip to the Arctic Ocean.

The ship will depart from the northern city of Tromso to the Arctic, will go to Alaska, and from there will go south. And in October, according to the plan, sail along the coasts of Antarctica. And while the hybrid ship can only swim for more than an hour on an electric power alone, environmentalists say the new engine will significantly save fuel and reduce carbon dioxide emissions by 20 percent.

In the new version of Telegram appeared animated stickers.

“We started stickers as early as January 2015. Today we introduce a new format – animated stickers. We asked ourselves: Can animated stickers be better quality than static, and at the same time consume less traffic? The answer turned out to be positive”, – Telegram reported.

Each animated sticker weighs about 20 – 30 kilobytes – six times less than the average photo. According to developers, such stickers consume less battery power than GIF animations.

Several standard animated sticker sets are now available. Users, as in the case of regular stickers, can also create new sets themselves.

Ukraine lost 23 positions in the ranking of countries at the speed of the Internet, and now occupies the 81st place.

According to the analytical firm, the average download speed in Ukraine is 7.72 Mbps. And the time it takes to download 5GB is 1:28:28.

The countries with the highest speeds in broadband networks were called Taiwan, Singapore, Japan, Norway, Sweden, Denmark, Luxembourg. The United States was in the 15th place, and Canada was 25th. Poland took 28th place, and Belarus – 57th.

Programmer John Park has come up with an application that can show GIFs with actor Keanu Reeves and that’s all.

The program is designed for the Adafruit PyGamer portable set-top box. The developer states that it is not hidden content in the program – here are just collected various GIFs with Keanu Reeves in a different mood. Gifs change automatically every 10 seconds.

You сan also switch them independently if you want to see the “new” Kiaan Reeves. Moreover, users can download their own GIFs in the application itself. But, there is a prerequisite: they should only have Keanu Reeves.