If you read 1 list, read this one

There are literally thousands of "web 2.0" companies, and until now,
there's been no easy way to compare which ones are getting traffic. The
list of 952 sites below was inspired by the list started by Bob Stumpel and then added to by many others.

For our purposes, my definition is that most of these companies are, as the wikipedia
says, sites that "let people collaborate and share information online
in a new way." So, Google doesn't make the cut, because most of their
traffic comes to their search engine. eBay is an "old" company, but the
many-to-many nature of the site means that they do.