Just 30-minutes ago, Facebook has announced in its blog that Graph API now support “Field Expansion”.
According to Facebook,
Field expansion significantly improves performance for API calls and reduces your coding effort for retrieving data from the social graph. You can now make advanced Graph API queries to get the exact data you need, in fewer API calls. You can also create nested queries, similar to what you can do with FQL multi-queries. The call response maintains data hierarchy, so you don’t have to post-process the data either.
Tehcnically, it allows us to effectively “join” multiple graph queries into a single call as long as we are getting data on connected objects.
For details, see Facebook’s documentation on Field Expansion.