This dataset contains tweets about the migrant crisis of 2015. Download.

A line of the form:
t u1 u2
means that user u1 retweeted a tweet of user u2 at time t.

If you use this dataset, please cite the following paper:

Erik Borra, Bernhard Rieder, (2014)
Programmed method: developing a toolset for capturing and analyzing tweets,
Aslib Journal of Information Management, Vol. 66 Iss: 3, pp.262 - 278.
DOI