How do I invite my entire fraternity on Spring Break without worry of being labeled as spam?

Dude, you can check out this cool thing called Tripvite out. It'll help you make your own customized trip, call as many friends as you want and you can do this through an evite like form and here's the really cool thing about this - you can see who's accepted your invitation as well as who's not. Also, you can see the maybes. It's cool stuff. this might be what you're looking for.