Via FacebookYouTubeVia YouTube
Technically Facebook was launched in February 2004 (even though it was only available to students up until September 2006) and Youtube was launched in February 2005.
Reddit was launched in June 2005 and Twitter a year later, in July 2006.
TumblrVia TumblrVia LinkedIn
LinkedIn was launched in May 2003 and Tumblr in February 2007.
VineVia VineSnapchatVia Snapchat
Snapchat was launched in September 2011 and Vine in January 2013.
Via InstagramGoogle+Via Google Plus
Instagram was launched in October 2010 and Google+ in June 2011.
Pinterest was launched in March 2010 and ASKfm in June 2010.