Human perception is a crucial factor in the evaluation and use of an application or artefact. Currently, there is a relevant number of websites that rely on collaborative tagging: such systems allow users to add tags (words) for categorising contents. In this work, we explored a methodology for detecting human perception by using collaborative tagging systems. This approach highlighted the potential use of such systems evaluating the end users' perception without requiring a significant effort in designing specific evaluation tools like, for instance, questionnaires.