Our students worked in five mixed groups on Edmodo. They were assigned to groups by the teacher. In each group there were children from both countries. Then, they started to chat with each others in order to get the answer to the questions that teachers wrote in their groups.
Spanish students had to write down the Polish answers, and Polish students, the Spanish ones.
If the answer was correct, (the spelling and grammar) they wrote the answer in a shared document.
You can read the document with the results here.