The scale of the massive hack on Yahoo's server tops other recent, major tech breaches - such as MySpace (359 million), LinkedIn (164 million) and Adobe (152 million).
"I would have thought most companies had learned by now that early disclosure is better, even if you have to revise and update as you learn more."
Top 10 previous breaches
1. MySpace accounts - 359m
2. LinkedIn accounts - 164m
3. Adobe accounts - 152m
4. Badoo accounts - 112m
5. VK accounts - 93m
6. Dropbox accounts - 68m
7. tumblr accounts - 65m
8. iMesh accounts - 49m
9. Fling accounts - 40m
10. Last.fm accounts - 37m
Source - haveibeenpwned.com
Yahoo was founded in 1994 by Jerry Yang and David Filo. In its first decade it was a pioneer of internet services.
Once the most popular website in the US, it was worth about $125bn, but Yahoo lost ground towards the end of the first decade of the century, leading to its purchase by Verizon.
Verizon's motivation for purchasing the struggling Yahoo was to simply gain its massive user base. More than a billion people visit a Yahoo-owned site every month, and Verizon was hoping to use that to sell targeted advertising.
Yahoo Timeline
1994 Yahoo - which stands for Yet Another Hierarchically Organized Oracle - is founded
2000 Yahoo valued at $125bn at height of dot.com boom
2002 Google rejects a $3bn bid from Yahoo
2008 Microsoft's $44.6bn offer for Yahoo is turned down
2013 Blogging site Tumblr acquired by Yahoo for $1.1bn
2015 Yahoo makes net loss of $4.4bn
2016 Verizon agrees $4.8bn deal to buy Yahoo
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