Even though they didn't create the first search engine, this **** is more or less fundamental to the internet. I can't imagine the internet without Google, and I used to be a slave to Yahoo! search (I have no idea what the **** I was thinking as a kid).
In other news, according to Alexa, Facebook now ranks above Google in traffic on a global scale. **** *****.
YouTube was launched in 2005 and was bought by Google in 2006... but I don't think Google linked to it on their homepage until sometime within the last year, which is when I learned that the two companies were connected.
That's about all I know, though... I'm afraid I'll never understand the stock world!