The 2015 BES is collected data on the context of the 2015 campaign via twitter; analysing the general discussion on twitter during the campaign, the tweets, tweets received and twitter followers of a large YouGov panel and also the BES YouGov panel. These data are available here.
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Daily aggregate twitter tracking data of the 2015 general election campaignGibson, R., Fieldhouse, E., Green, J. and Southern, R. (2016). iBES Aggregate Twitter Daily Campaign File v1.0.