Growing collection of tweets (>315M) harvested using free developer accounts (they return about 1% of all tweets), one for every capital city. The temporal coverage has been patchy in some years due to technical issues and banning of accounts by Twitter.
Organisations/Institutions: University of Melbourne
Access conditions: As per https://developer.twitter.com/en/developer-terms/agreement-and-policy
Point of contact for this datasets: Prof Richard Sinnott (email@example.com)