There are many databases available for academic searching, and there is a list of those available to University of Reading users.
Google Scholar is a good overarching tool for searching through a number of these, via the preferences you can tell Google up to three libraries you are a member of and in return it will show you where the full text is available at those libraries, if you are off-campus you will need to authenticate to get access (details of how to do this at the library site). It will also show if the materials are available in institutional repositories such as Centaur.
However if like me you are interested in research on Twitter you will have difficulties as Google Scholar throws up all articles on pages which have buttons that say things like “Share this on Twitter” as well as those with Twitter in the title or text.
There is an earlier post on Google Scholar Citations which may be of interest.