Are there any limits on querying the Social Graph API?
Yes. Use of the Social Graph API is subject to a query limit of 50,000 queries per user per day. If you go over this 24-hour limit, the Social Graph API may stop working for you temporarily. If you continue to exceed this limit, your access to the Social Graph API may be blocked. Please contact us at socialgraph-request [at] google.com if you would like this limit raised for your application.