The partner schools are from Turkey, Portugal, Ukraine, Azerbaijan, Spain, Poland, and Romania. Regarding 21st-century skills, English as a writing language has become more important, with the increase of using social media in teenagers in pandemic term. So we are aiming to develop students' English writing skills by using different collaborative web 2.0 tools. The age of students will be 10-14. Students have worked and improved their writing skills not only being individually but also in the international mixed team. The project has started in October 2020 and will end in February 2021.