Launch Years Of Internet Top 10 Websites

Do you know when the internet top 10 websites are launched?  Go through the below list    Website Name : Amazon.com 
Launched On : 1994    Website Name : Yahoo !  Launched On : March 1994    Website Name : Google  Launched On : Sept 4, 1998    Website Name : Tencent QQ  Launched On : February 1999     Website Name : Baidu  Launched On : Jan 1, 2000    Website Name : Wikipedia  Launched On : Jan 15, 2001    Website Name : Facebook  Launched On :Feb 4, 2004    Website Name : YouTube  Launched On : Feb 14, 2005    Website Name : Windows Live  Launched On : Nov 1, 2005    Website Name : Twitter  Launched On : March 21, 2006