The analysis of vast quantities of historical newspaper content has been pioneered by Dzogang et al.,<ref>{{Cite journal|last=Dzogang|first=Fabon|last2=Lansdall-Welfare|first2=Thomas|last3=Team|first3=FindMyPast Newspaper|last4=Cristianini|first4=Nello|date=2016-11-08|title=Discovering Periodic Patterns in Historical News|journal=PLOS One|volume=11|issue=11|pages=e0165736|doi=10.1371/journal.pone.0165736|issn=1932-6203|pmc=5100883|pmid=27824911|bibcode=2016PLoSO..1165736D}}</ref> which showed how periodic structures can be automatically discovered in historical newspapers. A similar analysis was performed on social media, again revealing strongly periodic structures.<ref>[https://core.ac.uk/download/pdf/83929129.pdf Seasonal Fluctuations in Collective Mood Revealed by Wikipedia Searches and Twitter Posts] F Dzogang, T Lansdall-Welfare, N Cristianini - 2016 IEEE International Conference on Data Mining, Workshop on ''Data Mining'' in Human Activity Analysis | The analysis of vast quantities of historical newspaper content has been pioneered by Dzogang et al.,<ref>{{Cite journal|last=Dzogang|first=Fabon|last2=Lansdall-Welfare|first2=Thomas|last3=Team|first3=FindMyPast Newspaper|last4=Cristianini|first4=Nello|date=2016-11-08|title=Discovering Periodic Patterns in Historical News|journal=PLOS One|volume=11|issue=11|pages=e0165736|doi=10.1371/journal.pone.0165736|issn=1932-6203|pmc=5100883|pmid=27824911|bibcode=2016PLoSO..1165736D}}</ref> which showed how periodic structures can be automatically discovered in historical newspapers. A similar analysis was performed on social media, again revealing strongly periodic structures.<ref>[https://core.ac.uk/download/pdf/83929129.pdf Seasonal Fluctuations in Collective Mood Revealed by Wikipedia Searches and Twitter Posts] F Dzogang, T Lansdall-Welfare, N Cristianini - 2016 IEEE International Conference on Data Mining, Workshop on ''Data Mining'' in Human Activity Analysis |