The use of blogs in EFL settings considerably supports learner-centered interactive learning and constructivist environments. Moreover, using blogs to provide instructor's feedback has a crucial role in the language learning process. The present study aimed to explore Iranian EFL learners' perceptions of blog assignments and instructor's e-feedbacks thereof. To this end, assignments were established and teacher's feedbacks were transmitted via the blogs for a period of one educational semester. Data were triangulated and collected using think-aloud protocols and reflexive journals during the semester, as well as semi-structured interviews at the end. Data analysis through grounded theory further revealed six major categories: educational effects, psychological effects, technological effects, social effects, teacher's traditional feedbacks vs. e-feedbacks, and students' preferences of e-feedbacks. Accordingly, implications are discussed in light of EFL settings.