Wowza... imgur showcases the most dramatic change out of all of them.
If you want a trip down memory lane... Time's popular sites in 2009.
Vimeo, Hulu, kayak, Netflix, Spotify, Help, Mint, Open Table.
TIL walmart.com is good.
From what I understand, Walmart has a very impressive tech team. https://www.walmartlabs.com/
Any other websites I should add to the post?