StumbleUpon Logo — StumbleUpon is a commercial website that integrates a social network that allows users to exchange online pages of interest mainly using atoolbar available as an extension to the browser Firefox , Mozilla Application Suite , Internet Explorer and Google Chrome . The system automates the collection, distribution and review of web content in an intuitive way, providing the user to browse the network and locate pages of interest with a single click, after completing an initial registration where the user identifies their areas of interest and other preferences.

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On May 30, 2007 StumbleUpon was acquired by the company eBay for the amount of 75 million U.S. dollars. More

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Download Napster Logo — Napster was a file distribution service to music in PDF format ( MP3 ), the first major network P2P exchange created by Shawn Fanning . Its popularity began during the year 1998 . Its technology allowed music fans to share their collections of MP3 easily with others, which led the protests of the institutions that protect copyright .

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The service was named Napster (“siestero”) by the pen name of Fanning (said to be used much sleep nap). The first version of Napster was published in late 1999 . It was the first system file sharing between pairs of mass popularity, and was a centralized network as a primary server used to maintain the list of connected users and files shared by each of them. File transfers, however, were made ​​between users without intermediaries. More

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VeriSign Logo — VeriSign is a company that provides infrastructure services for telecommunications networks, including Internet. Its main activity in terms of turnover is the signature of certificates: Verisign allows users to identify interlocutors, thus limiting the possibilities of attacks such as “Attack of the middle man.”

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In addition, VeriSign manages the databases that determine the interpretation of Internet addresses of the domains .com and .net . That is to say that when you are trying to reach www.example.com server Verisign will be more or less directly contacted to identify the IP address of the server you need to contact. In 2003, VeriSign has set up a controversial one that uses this unique position. More

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ICQ Logo — ICQ ( “I seek you” in Castilian seek you ) is an instant messaging client and the first of its kind to be widely used in Internet , through which you can chat and send instant messages to other users connected to the network ICQ. It also allows sending files, video and voice chat. ICQ was created by the company Israeli Mirabilis in late 1990. On June 8, 1998 the company was acquired by AOL for $ 407 million. Today ICQ is used by over 38 million users worldwide. According to Time Warner , ICQ has over 50 million registered accounts.

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The communications protocol used by ICQ is known as OSCAR , also used by AIM . The ICQ network users are identified by a number which is assigned when registering a new user, called UIN ( “Universal Internet Number” or “universal number of Internet”). Due to the large number of users of ICQ, the most recent user IDs are above the number 100,000,000. In some cases, the numbers simple and easy to remember are sold on Internet auction or kidnapped by other users. More

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Pidgin is an instant messaging client platform capable of connecting to multiple networks ( multi ) and accounts ( multiaccounting ) simultaneously. It was estimated that about 3 million people used Pidgin in 2007.

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The program was originally written around 1999 by Mark Spencer , a student at Auburn University , as an emulation of the instant messaging program for AOL (AOL Instant Messenger, AIM ) performed on Linux using the library GTK + . So called GAIM ( GTK + AOL Instant Messenger ). The emulator was not done by reverse engineering , but based on AOL’s own documentation published on the web and the development was supported by AOL staff. March 4 to support other messaging protocols will be added later. More

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Digsby Logo — Digsby is an instant messaging client , instant messaging services, social networking platforms and e-mail communication merges. The software combines all networks under one interface and provides access to AIM , the Windows Live Messenger , Yahoo Messenger , GoogleTalk and other XMPP services, the social networks Facebook and MySpace , the microblogging service Twitter , as well as any e-mail inboxes. First, only a beta version was released, for which one needs a so-called “invitation code” to install them. Since 20 March 2008 will no longer need this invitation code.

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Digsby became especially critical, since it is the computing time of its users “sold”. This was also confirmed by a Digsby developers, but you can disable this function. When installing the software, some programs, toolbars etc . offered for installation, while the design is apparently designed to motivate the user to accept. In addition, Digsby stores all account information, including passwords to a server by the owner. Why such a way sensitive information is not stored locally is not explained. More

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