In terms of learning purposes, Facebook can promote the Affective Filter Hypothesis and Social Constructivist Theories. According to Krashen (1981), motivation, attitude, self-confidence, and anxiety are principle factors in second language acquisition. High motivation, a good self-image, and a low level of anxiety lower the Affective Filter thus increasing the amount of compre-hensible input, which eventually contributes to language learning (Krashen, 1988). In normal classroom settings, many students experience such problems as the fear of being considered as a fool, the anxiety of speaking in front of class, and many other negative feelings, all of which pre-vent them from participating or even cause them to get panicked (Warschauer, 1996).