This paper is meant to provide a brief introduction to a variety of emerging Web 3.0 and mobile technologies and its application that can be used in Foreign Language Teaching and Second Language Teaching. Especially, the unique potential and anticipated growth of mobile technologies for language production and consumption are discussed as an ideal opportunity to improve the reliability, involvement and functionality, and overall effectiveness of language learning within and beyond the classroom. A number of representatives‟ mobile Web 3.0 technologies will be examined and their applications to language pedagogy will be elucidated in conjunction with relevant shifts of second language acquisition theory and instructional praxis. Implications for future innovation and opportunities for additional research will be discussed.