“…Unlike folders, tags are non‐hierarchical and users can assign as many tags as they want to an information item. In recent years, there has been extensive development of tag‐related PIM prototypes, including: Phlat (Cutrell, Robbins, Dumais, & Sarin, 2006), TagFS (Bloehdorn & Völkel, 2006), Gnowsis (Sauermann et al, 2006), ConTag (Adrian, Sauermann, & Roth‐Berghofer, 2007), TapGlance (Robbins, 2008), Zotero (Ma & Wiedenbeck, 2009), TAGtivity (Oleksik et al, 2009), BlueMail (Tang et al, 2008; Whittaker, Matthews, Cerruti, Badenes, & Tang, 2011) and TagStore (Voit, Andrews, & Slany, 2012).…”