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2. Toll-free telephone numbers in the North American Numbering ...

   en.wikipedia.org/wiki/Toll-free_telephone...

   In the early 1980s, Bell Labs received a patent for what became AT&T's "Advanced 800 Service", a computer-controlled system where any toll-free number could point to any destination number, such as to a small business local number instead of a special InWATS line, and an itemized bill generated only for the calls the business actually received.

3. AIM (software) - Wikipedia

   en.wikipedia.org/wiki/AIM_(software)

   Around 2011, AIM started to lose popularity rapidly, partly due to the quick rise of Gmail and its built-in real-time Google Chat instant messenger integration in 2011 and because many people migrated to SMS or iMessages text messaging and later, social networking websites and apps for instant messaging, in particular, Facebook Messenger, which was released as a standalone application the same ...

4. Messenger (software) - Wikipedia

   en.wikipedia.org/wiki/Messenger_(software)

   Messenger, [11] also known as Facebook Messenger, is an American proprietary instant messaging service developed by Meta Platforms.Originally developed as Facebook Chat in 2008, the client application of Messenger is currently available on iOS and Android mobile platforms, Windows and macOS desktop platforms, through the Messenger.com web application, and on the standalone Facebook Portal ...

5. Rich Communication Services - Wikipedia

   en.wikipedia.org/wiki/Rich_Communication_Services

   Adds group chat icons, group chat change of subject, and file transfer enhancements. [100] Support for passing group chat administrator to another participant, and allowing various features to fall back to SMS. [102] Version 2.1 (December 2017) [99] References the same RACSCS Release 7.0 Version 8.0 as Universal Profile Version 2.0.

6. Free group - Wikipedia

   en.wikipedia.org/wiki/Free_group

   This cardinality is called the rank of the free group F. Thus for every cardinal number k, there is, up to isomorphism, exactly one free group of rank k. A free group of finite rank n > 1 has an exponential growth rate of order 2n − 1. A few other related results are: The Nielsen–Schreier theorem: Every subgroup of a free group is

7. SMS - Wikipedia

   en.wikipedia.org/wiki/SMS

   An SMS message written on a Motorola Razr V3. Short Message Service, commonly abbreviated as SMS, is a text messaging service component of most telephone, Internet and mobile device systems.

8. VK (service) - Wikipedia

   en.wikipedia.org/wiki/VK_(service)

   VK (short for its original name VKontakte; Russian: ВКонтакте, meaning InContact) is a Russian online social media and social networking service based in Saint Petersburg.

9. Group (online social networking) - Wikipedia

   en.wikipedia.org/wiki/Group_(online_social...

   A group (often termed as a community, e-group or club) is a feature in many social networking services which allows users to create, post, comment to and read from their own interest- and niche-specific forums, often within the realm of virtual communities. Groups, which may allow for open or closed access, invitation and/or joining by other ...