This collection includes data for 30 different Twitter datasets associated with real world events. The datasets were collected between 2012 and 2016, always using the streaming API with a set of keywords.
These datasets are released in accordance with Twitter's TOS, which allows sharing of tweet IDs and are intended for non-commercial research.
Note: Twitter's developer policy doesn't allow sharing more than 1,500,000 tweet IDs (https://dev.twitter.com/overview/terms/policy#updated-policy), unless the author is affiliated with an academic institution (which is my case) and tweet IDs are solely used for non-commercial purposes (https://twittercommunity.com/t/policy-update-clarification-research-use-cases/87566). Hence, by downloading these datasets you agree that you will not use it for commercial purposes.
Please cite the following paper if you make use of these datasets for your research: https://onlinelibrary.wiley.com/doi/full/10.1002/asi.24026