yesterday wikipedia , the full encyclopedia that those with access to the internet can edit , was the focus of an onslaught of practical jokes , as april fool ' s day played in various timezones around the worldwide , at only those to mainly follows the gregorian calendar . it is claimed that wikipedia contributors were kept busy tidying up and removing wikipedia articles and changes made by other wikipedia contributors , and were reported to be cleaning up the carnage for days subsequently .
readers of online encyclopedias can alter the contents .