Introduction: Social networking sites (SNSs) have become a popular method for students to share information and knowledge and to express emotions. They enable students to exchange video files, text messages, pictures and knowledge sharing. They provide an opportunity for students to improve...

Meta-search engines are created to reduce the burden on the user by dispatching queries to multiple search engines in parallel. Decisions on how to rank the returned results are made based on the query's keywords. Although keyword-based search model produces good results, better results can be...