The Internet Archive is a non-profit library of millions of free books, movies, software, music, websites, and more. Their WayBack Machine lets you look up older versions of websites going back to 1998. This is a great tool to help your students find primary resources!

In this example, I looked up The New York Times webpage on February 24th, 2001.

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 Did you know that in 2004, www.facebook.com was the web address for a database software company?

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And this is what an early iteration of Facebook looked like in 2006. Back then it was limited to students only. 

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With the Wayback Machine, your students can learn so much about our digital history!