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"VKontakte" - a social network owned by Mail.Ru Group . Located at vk.com. According SimilarWeb, «VKontakte» is the first most popular website in Russia and Ukraine, the 4th - in the world . According to Alexa Internet, the third most popular site in Russia and Ukraine, the second - in Belarus, 21 minutes - in the world .
Launched on October 10, 2006, the resource is initially positioned itself as a social network of Russian universities students and graduates , and later began to call himself "a modern, fast and attractive way to communicate on the network".  In January 2014 the daily audience "VKontakte" was about 60 million people  , and in January of 2015 - 70 million people a day.  As of July 15, 2015, the average daily audience of 64,525,950 visitors. 
The Director-General (2014) - Boris Dobrodeev son Oleg Dobrodeeva - General Director of the Russian State Television and Radio Broadcasting Company. 
The users "VKontakte" is available characteristic of the many social networking feature set: to create a profile with information about themselves, the production and distribution of content, flexible access control settings, interaction with others privately (via private message) and the public (through records on the "wall" as well as through the mechanism of the groups and meetings), tracking through the news feed activity for friends and communities.
Besides being able to write a message, the user can leave comments under the already published content. You can "attach" pictures, audio and video recordings (including feature films), documents and surveys to their messages.
Ability to upload to the site and use your own recording files uploaded by other users, makes "VKontakte" one of the largest media archives Runet. Of all the online user can create a file in your profile personal record collection, if desired, by grouping them into separate galleries. At the same time put a limit to the number one album - 10,000 images.
"VKontakte" offers a third-party resources to use specially designed tools for deep integration with the social network - widgets. These solutions make it possible to embed in websites commenting system for users, communities, polls system, as well as the ability to easily share a link to the material with others and to login.
Interface "VKontakte" is available in over 70 languages. As an alternative offer (referring to the style of presentation) "Soviet" and "Dorevolyutsionny".
The site has a mobile version, located at m.vk.com. Some mobile operators is available for "free" (without traffic payment), the mobile version - 0.vk.com (light version without access to video, audio and photo)  .
There is also a "VKontakte" applications on different platforms (iOS , Android , Windows Phone ).
From April 2010 to August 15, 2011 operated Merchant API - electronic payment system VKontakte .
"VKontakte" as any major social network, can serve as a convenient platform for scams. Thus, in the sent letters by hand or post to the group, users are offered a preferential way to boost rankings by sending an SMS to a specific short code. At least part of the letter sent to all the contacts list with a request to send an SMS to a short number to gain access to the required site, in which case delivery is via user accounts that have infected computers Trojans  like a mobile Trojan Trojan-SMS.J2ME.Konov .b , or provide your e-mail and password phishing site. In addition, fraudsters can gain access to a victim's computer, using programs such as Trojan.Win32.Crypt.ey . In 2009, attackers posted in open access passwords to 135 thousand. Account. Data were collected using a Trojan for the Windows operating system  . In some cases, users infect a computer worm Win32.HLLW.AntiDurov, lost files  . Administration draws attention in this case that the catch is only possible on external sites  .
Along with other social networks "VKontakte" is often called one of the most convenient sources for information extraction and retrieval of personal data. In particular, bank agents use social networks to find debtors , and the bailiff service sends notification of the debtor to initiate cases against them . Manual "VKontakte" states that the detection removes the "reservoir" accounts . Also on request remove "clones" discrediting honor and dignity of known persons  . The Administration indicates that users can decide how much information to disclose about themselves, and also have advanced features for managing privacy .
It has been observed that by VKontakte conducted DDoS-attacks on other sites due to resource users of the site. Realized it was in an invisible iframe, refers to the page of the target site. Sometimes the added code iframe reloads at intervals.
Due to the fact that "VKontakte" - one of the most visited sites in RuNet, the number of requests to the target site becomes equal to or more times greater than the number of requests for the site itself VKontakte. Most of the sites on this load is simply not calculated (due to economic reasons), so websites in time were disabled. In October 2008, the site was attacked RuNet Award , and at the end of April 2012 DDoS-attack was carried out on site antigate.com, specializing in deciphering CAPTCHAs  .
As with any resource on the Internet, the site VKontakte is exposed to be unavailable due to technical difficulties. In the case of popular resources, failures in the website even for a short time causes the user response.
In the history of VKontakte, there are some notable failures, which resulted in the site was unavailable for several hours. So, July 25, 2010 there was one of the longest failures: more than four hours, the site remained inaccessible due to power outages in the data center . Another failure took place July 27, 2014: then in an accident in one of the data center's website was also inaccessible to users . August 4, 2015 VKontakte site remained inaccessible for more than two hours. According to the company's press service, the physical cause of the problem was the cable break, connecting data centers . Later, it was reported  that the cause of failure was "fatal coincidence of circumstances."
The increased number of  unavailability led to the popularization of VKontakte Twitter hashtag # vkzhivi .
New Design (2016)
August 17 PC-version of the site VKontakte has been fully translated into the new design. Work on the redesign was carried out over one and a half years. April 1 was started public testing of the new design for everyone. During the four and a half months Vkontakte team studied user feedback and have made more than 2,500 small and large patches. According to some users, the new design appeared uncomfortable with a lot of flaws. As a result, users have started to collect signatures for a petition demanding the return of the former design the site (about 50 000 signatures were collected for 3 months) . The founder of the social network VKontakte Pavel Durov listed the 7 major disadvantages of the new design, which held that the redesign is not only consistent with modern web standards, but also reduces the usability of the site .