What is the ruling on joining and participating in the Christian and Jewish program "Facebook," especially for those weak in faith who are not people of knowledge, knowing that preachers and sheikhs join it to guide the weak and help them in their devotion to Allah?

It is not permissible to argue with the people of disbelief and misguidance except for one who is deeply knowledgeable in Islamic sciences; because the argumentation of common folk with them is a strong means for them to be tempted by their innovations and specious arguments.