Gonna skip a few but:

a: http://archive.org

b: http://bandcamp.com

d: http://discogs.com

f: http://facebook.com

g: http://google.com

h: -local hotel website-

i: http://instagram.com

j: -local technology retail store-

k: http://kahoot.it

l: http://last.fm

m: http://m.facebook.com/

n: http://netflix.com/

o: http://opendns.com/

p: http://play.google.com/

q: -local government website-

r: http://reddit.com/

s: -local school website-

t: http://twitter.com/

u: -local (very good) computer store-

w: http://whosampled.com/

y: http://youtube.com/

z: http://zippyshare.com/