Timeline of WhatsApp
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|Year||Month and date||Event type||Details|
|2009||February 4||Company||Jan Koum incorporates WhatsApp in California.|
|2009||October||Funding||Brian Acton persuades five ex-Yahoo! friends to invest $250,000 in seed funding, and is granted co-founder status.|
|2009||August||Product||WhatsApp 2.0 is released on the App Store for the iPhone.|
|2009||December||Product||WhatsApp for the iPhone is updated to send photos.|
|2010||August||Product||WhatsApp support for Android OS is added.|
|2011||January 21||Competition||WeChat, a messenger app, is founded. It eventually becomes very popular in China.|
|2011||April||Funding||In Series A round, WhatsApp founders agree to take $7 million from Sequoia Capital on top of their $250,000 seed funding, after months of negotiation with Sequoia partner Jim Goetz.|
|2011||May||Competition||SnapChat, a competing photo messaging app, is founded.|
|2012||January 6||Security||An unknown hacker publishes a website that makes it possible to change the status of an arbitrary WhatsApp user, as long as the phone number was known.|
|2012||August||Security||The WhatsApp support staff announce that messages were encrypted in the "latest version" of the WhatsApp software for iOS and Android (but not BlackBerry, Windows Phone, and Symbian), without specifying the cryptographic method.|
|2013||February||Userbase||WhatsApp's user base swells to about 200 million active users and its staff to 50.|
|2013||July||Funding||Sequoia invests another $50 million in Series B round, valuing WhatsApp at $1.5 billion.|
|2013||July 16||Product||WhatsApp goes free, with an annual subscription fee of $1 after the first year.|
|2013||August||Competition||Telegram, a cloud-based instant messaging service, launches.|
|2013||August||Product||WhatsApp introduces voice messaging.|
|2014||February 19||Company||Facebook announces its acquisition of WhatsApp for US$19 billion, its largest acquisition to date. Facebook pays $4 billion in cash, $12 billion in Facebook shares, and an additional $3 billion in restricted stock units granted to WhatsApp's founders.|
|2014||February 22||Product||Koum said they were working to introduce voice calls in the coming months|
|2014||March||Security||Someone discovers a vulnerability in WhatsApp encryption on the Android application that allows another app to access and read all of a user’s chat conversations within it.|
|2014||November||Product||WhatsApp introduces a feature named Read Receipts, which alerts senders when their messages are read by recipients. Within a week, WhatsApp introduces an update allowing users to disable this feature so that message recipients do not send acknowledgements.|
|2015||January 21||Product||WhatsApp launches WhatsApp Web, a web client which can be used through a web browser by syncing with the mobile device's connection.|
|2015||January 21||Product||WhatsApp announces its policy on cracking down on 3rd-party clients, including WhatsApp+. Users would not be able to use WhatsApp’s services at all until the third-party apps are uninstalled.|
|2015||December||Legal||WhatsApp is briefly shut down in Brazil after it refuses to place wiretaps on certain WhatsApp accounts. It is shut down in Brazil again on May 2016 and in July 2016.|
|2016||January 18||Product||Jan Koum announces that WhatsApp will no longer charge its users a $1 annual subscription fee. There is still no clear plan for monetizing WhatsApp.|
|2016||March||Legal||Diego Dzodan, a Facebook executive, is arrested by Brazilian federal police after Facebook fails to turn over information from his WhatsApp messaging account into a judge's request for a drug trafficking investigation.|
|2016||March 2||Product||WhatsApp introduces its document-sharing feature, initially allowing users to share PDF files with their contacts.|
|2016||April 5||Product, Security||WhatsApp and Open Whisper Systems announce that they finish adding end-to-end encryption  to "every form of communication" on WhatsApp, and that users could now verify each other's keys.|
|2016||May 10||Product||WhatsApp is introduced for both Windows and Mac operating systems.|
|2017||September 5||Product||WhatsApp started external testing of an enterprise platform which enables companies to provide customer service to users at scale. Airline KLM launches such a service.|
- Metz, Cade (5 April 2016). "Forget Apple vs. the FBI: WhatsApp Just Switched on Encryption for a Billion People". Wired. Condé Nast. Retrieved 13 May 2016.
- Parmy Olsen (February 2, 2014). "Exclusive: The Rags-To-Riches Tale Of How Jan Koum Built WhatsApp Into Facebook's New $19 Billion Baby". Forbes. Retrieved January 14, 2015.
- "WhatsApp 2.0 is submitted - WhatsApp Blog". Retrieved June 5, 2016.
- "Three-quarters of WhatsApp users are on Android, 22% on iOS (study)". Venturebeat.com. Retrieved June 5, 2016.
- "5 years of WeChat". Retrieved June 5, 2016.
- "Snapchat". Retrieved June 5, 2016.
- Schellevis, Joost (January 12, 2012). "What's app status: van Anderen os nog steeds te wĳzigen" (in Dutch). Tweakers. Retrieved January 12, 2012.
- rvdm (January 12, 2012). "How What's app net works". Wire trip. Archived from the original on November 5, 2013. Retrieved April 7, 2013.
- "Are my messages secure?". WhatsApp (FAQ). Zendesk. August 15, 2012. Retrieved January 29, 2013.
- "PrivCo". Privco.com. Retrieved May 30, 2016.
- "The Granddaddy Of Messaging Apps, WhatsApp, Finally Goes For A Subscription Model on iOS". Techcrunch.com. Retrieved June 8, 2016.
- "WhatsApp, the Internet Messenger, to Become Free". The New York Times. Retrieved August 28, 2016.
- "Russia's Zuckerberg launches Telegram, a new instant messenger service". Reuters.com. Retrieved June 5, 2016.
- "Voice Messaging Comes To Whatsapp". Techcrunch.com. Retrieved June 6, 2016.
- "WhatsApp Was Valued At ~$1.5B In Final Round Before Sale". Techcrunch. Retrieved February 22, 2014.
- "Facebook to Buy WhatsApp for $19 Billion". The Wall Street Journal. Retrieved August 28, 2016.
- "Hole In WhatsApp For Android Lets Hackers Steal Your Conversations". Techcrunch.com. Retrieved June 6, 2016.
- "Whatsapp now lets you disable Read notifications". November 15, 2014.
- "WhatsApp Web". January 21, 2015.
- "WhatsApp Says It's Not "Permanently" Banning Users From Its Service, Just Blocking Third-Party Clients". Techcrunch.com. Retrieved June 6, 2016.
- "Brazil Restores WhatsApp Service After Brief Blockade Over Wiretap Request". The New York Times. December 17, 2015. Retrieved August 28, 2016.
- "WhatsApp Is Briefly Shut Down in Brazil for a Third Time". The New York Times. July 19, 2016. Retrieved August 28, 2016.
- Ina Fried (January 18, 2016). "Facebook's Whatsapp is Now Free". Re Code. Vox Media, Inc. Retrieved January 18, 2016.
- "Whatsapp to Drop Subscription Fee". Wall Street Journal. Dow Jones & Company, Inc. January 18, 2016. Retrieved January 18, 2016.
- "No Subscription Charges For WhatsApp: Does Facebook Have A Monetization Strategy In Place?". Forbes. Retrieved May 30, 2016.
- "Brazil Arrests Facebook Executive in WhatsApp Data Access Case". The New York Times. March 1, 2016. Retrieved August 28, 2016.
- "WhatsApp adds support for document sharing, but only PDFs at launch". TechCrunch. March 2, 2016. Retrieved March 2, 2016.
- "Wassup WhatsApp? Is everything confidential?". Retrieved December 2, 2016.
- Metz, Cade (April 5, 2016). "Forget Apple vs. the FBI: WhatsApp Just Switched on Encryption for a Billion People". Wired. Condé Nast. Retrieved April 5, 2016.
- Lomas, Natasha (April 5, 2016). "WhatsApp completes end-to-end encryption rollout". TechCrunch. AOL Inc. Retrieved April 5, 2016.
- "WhatsApp Introduces End-to-End Encryption". The New York Times. April 5, 2016. Retrieved August 28, 2016.
- "Introducing WhatsApp's desktop app", WhatsApp Blog, 10 May 2016, retrieved 11 May 2016
- "Building for People, and Now Businesses". WhatsApp.com.