looking for a social schema

Hi everyone,
i would like to use a schema which is different and complementary of the 
foaf one, and which could contain a property like "number of friends".

Does someone know an available ontology i could use pls?

one of my query would look like :

PREFIX rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
PREFIX rdfs="http://www.w3.org/2000/01/rdf-schema#"
PREFIX dc="http://purl.org/dc/elements/1.1/"
PREFIX foaf="http://xmlns.com/foaf/0.1/"
PREFIX ............="_"

SELECT ?friendnb   WHERE { ?Person   ...;;;;:friendnb   ?friendnb   }

------------
| friendnb |
============
| "\n330\n" |
------------

Thank you in advance for your advices and your time

Cheers
Ghalem