“…As reviewed above, Mason and Rennie (2007) as well as Russo, Watkins, and Groundwater-Smith (2009) have shown that the value of social media is generally recognized for informal learning given its potential to encourage member participation within existing local communities. Drawing from the findings of Tu, Blocher, and Ntoruru (2008), while social networking tools can be useful for building virtual professional communities without local ties, sustaining the CoP may present potential obstacles, such as lack of trust, isolated feelings, and other affective factors which can be broadly conceived as lack of a sense of community.…”