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2. WhatsApp - Wikipedia

   en.wikipedia.org/wiki/WhatsApp

   WhatsApp (officially WhatsApp Messenger) is an instant messaging (IM) and voice-over-IP (VoIP) service owned by technology conglomerate Meta. It allows users to send text , voice messages and video messages, [15] make voice and video calls, and share images, documents, user locations, and other content.

3. Reception and criticism of WhatsApp security and privacy ...

   en.wikipedia.org/wiki/Reception_and_criticism_of...

   In September 2019, WhatsApp was criticized for its implementation of a 'delete for everyone' feature. iOS users can elect to save media to their camera roll automatically. When a user deletes media for everyone, WhatsApp does not delete images saved in the iOS camera roll and so those users are able to keep the images.

4. Jan Koum - Wikipedia

   en.wikipedia.org/wiki/Jan_Koum

   WhatsApp was initially unpopular, but its fortunes began to turn after Apple added push notification ability to apps in June 2009. Koum changed WhatsApp to "ping" users when they received a message, and soon afterward he and Fishman's Russian friends in the area began to use WhatsApp as a messaging tool, in place of SMS . [6]

5. Facebook - Wikipedia

   en.wikipedia.org/wiki/Facebook

   The outage was global in scope, and took down all Facebook properties, including Instagram and WhatsApp, from approximately 15:39 UTC to 22:05 UTC, and affected roughly three billion users. [215] [216] [217] Security experts identified the problem as a BGP withdrawal of all of the IP routes to their Domain Name (DNS) servers which were all self ...

6. German language - Wikipedia

   en.wikipedia.org/wiki/German_language

   German ( Standard High German: Deutsch, pronounced [dɔʏ̯t͡ʃ] ⓘ) [10] is a West Germanic language in the Indo-European language family, mainly spoken in Western and Central Europe. It is the most widely spoken and official or co-official language in Germany, Austria, Switzerland, Liechtenstein, and the Italian province of South Tyrol.

7. Obsidian (software) - Wikipedia

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

   obsidian .md. Obsidian is a personal knowledge base and note-taking software application that operates on Markdown files. [2] [3] It allows users to make internal links for notes and then to visualize the connections as a graph. [4] [5] It is designed to help users organize and structure their thoughts and knowledge in a flexible, non-linear way.