The digital social media s quick spread and its big popularity has built a favorable environment to the creation of brand communities. Increasingly, companies launch communities - known as fanpages on Facebook - as a way to approach their customers and reach brand loyalty. In face of that, this study sought to develop two new models in order to investigate how social media based brand communities affect brand loyalty. The literature review allowed this relation to be explored through the following constructs: functional benefits, social-psychological benefits, hedonic benefits, community commitment and word-of-mouth. The research data was collected via an on-line survey applied to Netflix s community members on Facebook, which had 1.236 valid responses. Structural equations modeling (SEM) was employed and confirmed all the research hypotheses, suggesting that social media based brand communities affect positively brand loyalty. The findings reveal that hedonic benefits are the major influencers of community commitment and word-of-mouth. Therefore, results show that the word-of-mouth from the community significantly influences brand loyalty.