Social casinos that offer a wide range of promotions

A friend of mine has been asking me to register with a social casino for a while, as he would get a bonus. However, I refuse. Perhaps it's unfair of me, and I should help him? But if I were to register somewhere, I would want there to be more than one bonus or promotion. Do you know of any casinos with a wide range of promotions? Can you recommend a good one?