The Internet Archive discovers and captures web pages through many different web crawls.
At any given time several distinct crawls are running, some for months, and some every day or longer.
View the web archive through the Wayback Machine.
Web wide crawl with initial seedlist and crawler configuration from October 2010
TIMESTAMPS
The Wayback Machine - https://web.archive.org/web/20110106225537/http://www.searchengineoptimising.com/glossary/glossary-of-computer-and-internet-terms/leaderboard
Leaderboards are a type of online advertisement that is 728?0 pixels. They can contain animations as well as text and when a person clicks into one they will be directed to the Web site of the advertiser.