This presentation will focus on how historian can use web archives to write the cultural history of the 2000s. In this aim, I will use several examples from my doctoral thesis defended in December 2015. This work was a first approach taking the French Web archives as a source in history. It concerned the study of the digital production of the memories of North African immigration on the French web from 1999 to 2014. I will also mobilize researches that are more recent on May 1968 online or on the history of French WebTV. My objective is to use my research as a starting point to propose broader avenues of analysis for other historians. In order to do this, -I will firstly present my research questions which was the one of my thesis defended in December 2015 ; -then,I will show you how I have built a methodology for analysing online sources and web archives by choosing a sociale and qualitative history, and finally, -I will briefly present some research results and considerations, focusing on what the Web has been doing at the factory of the past since the 2000s