Atitudes toward and perceptions of using Facebook as a portfolio-keeping tool in teaching English as a foreign language (EFL) writing. In general, existing research reveals primarily positive effects of Facebook on educational activities, and research on portfolio keeping in EFL writing shows both benefits and problem areas. Thus, the current study aims to investigate EFL writers' attitudes toward using Facebook as a portfolio (F-Portfolio) tool and their perceptions regarding its benefits and problems. The sample group consisted of 101 EFL learners. A portfolio attitude scale, portfolio contribution questionnaire and a portfolio problem questionnaire were used to collect data. Four results were obtained from the study: (1) EFL writers have positive attitudes toward the use of F-Portfolios in EFL writing; (2) F-Portfolios improve EFL learNo results have been reported regarding at- ners' knowledge of vocabulary and grammar, as well as their research, reading and writing skills; (3) EFL learners perceive some problems during the F-Portfolio process; and (4) some independent variables are significantly correlated with a limited number of items in the scales.