I started using the PKM tag in TiddlyWiki Talk Forum (here). The purpose is to discuss how to use TiddlyWiki as a PKM app in real life.
Ref: Personal knowledge management - Wikipedia
Personal knowledge management (PKM ) is a process of collecting information that a person uses to gather, classify, store, search, retrieve and share knowledge in their daily activities (Grundspenkis 2007) and the way in which these processes support work activities (Wright 2005). It is a response to the idea that knowledge workers need to be responsible for their own growth and learning (Smedley 2009). It is a bottom-up approach to knowledge management (KM) (Pollard 2008).