What is the ruling on a contest on "Facebook" that requires commenting with the ذكر الله (remembrance of Allah) to win food meals from a restaurant, and is it permissible to use the ذكر الله to achieve worldly aims?

The remembrance of Allah is one of the greatest and easiest acts of worship. The Prophet, peace and blessings be upon him, encouraged its constant practice and informed us that those men and women who remember Allah frequently are the "Mufarridoon." The remembrance of Allah is too sublime to be a means for advertising a restaurant or for worldly gain. Indeed, the Prophet, peace and blessings be upon him, warned against reciting the Qur'an for worldly purposes. Therefore, the use of the remembrance of Allah in advertising and promotion must cease. Restaurants can be promoted through other permissible means.