Internet Archive: http://archive.org

Cosmos Project: www.cosmosproject.net

Office for National Statistics: www.ons.gov.uk/ons/index.html

Office for National Statistics International Passenger Survey: www.ons.gov.uk/ons/guide-method/surveys/respondents/household/international-passenger-survey/index.html

Sentistrength: http://sentistrength.wlv.ac.uk

Snapbird Search Beyond Twitter’s History: http://snapbird.org

Social Media Collective About: http://socialmediacollective.org/about

Statistical Cybermetrics Research Group Webometric Analyst 2.0: http://lexiurl.wlv.ac.uk

Tweet Archivist Powerful, Affordable Twitter Analytics: www.tweetarchivist.com

UK Data Service (2012) Secure Access: http://securedata.data-archive.ac.uk

Webometrics: http://webometrics.wlv.ac.uk