Keyword Research Riddle...

What do the following words have in common? (Except for the obvious stuff like they appear together on this page and they are in alphabetical order...)

amazon
britney spears
circuit city
dictionary
ebay
facebook
google
hotmail
imdb
john lewis
kohls
lyrics
myspace
nintendo wii
office depot
paypal
quotes
runescape
sears
target
u tube
video
wikipedia
xbox 360
yahoo
zip codes

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