Replying to Save Money on Eating Out

I have had a job for 4 years now, (I'm 18) but aside from skiing and maybe even more than skiing, food is my biggest expense. I eat out alot with my friends and stuff but I started entering online websites for like different restaurants. Then they send you an email with a free meal for your birthday. You can just make different accounts and get free meals as you change your birthday to coincide with the date. I havent paid for eating out in past two weeks, with the exception of 10cents for cup for water.... You should try it, or do you have any other ideas