The past year some colleagues and I have been testing out the possibility of collecting survey data on Twitter. At the start of our study, we asked participants how much they Tweet . We then tracked their actual use of Twitter during the study, and it was surprising how inaccurate they were when reporting their use of Twitter.
Misreports of Twitter use
Richards, A. (2014). Misreports of Twitter use. In K. Woodfield (Ed.), Social Media in Social Research: Blogs on Blurring the Boundaries (Chap. 30) NatCen Social Research.