Is my Facebook app likely to get rate limited?
I've seen some conflicting answers about this on the web, perhaps you all can help me.

I'm running a game at an event which lasts about a week. I'll have 20+ users, so I'll have an access_token for each of them. During the course of that week, if one of those users likes my page, I'm going to give them points in my game. I've got another StackOverflow question about how to check for that in an efficient fashion, but for now I'm assuming that I'm going to have to make a request for each user, like:

    https://graph.facebook.com/me/likes/288674772026?access_token=...

However, I'll have 20,000+ users, so at first I'm going to have to make 20k+ requests to see if each of them have liked my page. Once a user likes my page and I see it during one of my checks, I'll mark them in my database so I don't have to check them again. However, that's still a crap load of requests.

At what point will my app get rate limited? I've read that my rate is based on how many requests I'm making per access_token. If that's true and I'm using a different access token for each request, will I still get rate limited?
Is my Facebook app likely to get rate limited?
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I've seen some conflicting answers about this on the web, perhaps you all can help me.

I'm running a game at an event which lasts about a week. I'll have 20+ users, so I'll have an access_token for each of them. During the course of that week, if one of those users likes my page, I'm going to give them points in my game. I've got another StackOverflow question about how to check for that in an efficient fashion, but for now I'm assuming that I'm going to have to make a request for each user, like:

    https://graph.facebook.com/me/likes/288674772026?access_token=...

However, I'll have 20,000+ users, so at first I'm going to have to make 20k+ requests to see if each of them have liked my page. Once a user likes my page and I see it during one of my checks, I'll mark them in my database so I don't have to check them again. However, that's still a crap load of requests.

At what point will my app get rate limited? I've read that my rate is based on how many requests I'm making per access_token. If that's true and I'm using a different access token for each request, will I still get rate limited?