In this paper, we make a practical approach to automated credibility assessment on Twitter. We describe the process behind the design of an automated classifier for information credibility assessment. As an addition, we propose practical implementation of TwitterBOT, a tool which is able to score submitted tweets while working in the native Twitter interface. Keywords Twitter, credibility, Machine Learning Algorithms Citation Computer Science • 16 (2) 2015 http://dx.doi.org/10.7494/csci.2015.16.2.157 Computer Science 16 (2) 2015: 157–168 157