Does Facebook have a maximum number of API connections?

If the answer is yes, then what is it?

By maximum number of connectioned allowed per application I mean how many instances开发者_JAVA技巧 of the same api/key can be used to get the friends list at any one time, will Facebook block too many requests?

EDIT I have been looking at http://developers.facebook.com/ but have not been able to find the answer to my question there.

From their Policy

If you exceed, or plan to exceed, any of the following thresholds please contact us as you may be subject to additional terms: (>5M MAU) or (>100M API calls per day) or (>50M impressions per day).

The only information I was able to find is something in a forum.

http://www.quora.com/Whats-the-Facebook-Open-Graph-API-rate-limit

After some testing and discussion with the Facebook platform team, there is no official limit I'm aware of or can find in the documentation. However, I've found 600 calls per 600 seconds, per token & per IP to be about where they stop you. I've also seen some application based rate limiting but don't have any numbers.

As a general rule, one call per second should not get rate limited. On the surface this seems very restrictive but remember you can batch certain calls and use the subscription API to get changes.

You can see how many API requests your users can have a day if you go to your Insights page and click on "Diagnostics". You can also see some other request statistics if you click on "Performance". http://www.facebook.com/insights