List of social vocabularies

Is there a list of social vocabularies some place?

A good starting point, if not, I think is the list from the activity
streams context:

    "dc": "http://purl.org/dc/elements/1.1/",
    "dct": "http://purl.org/dc/terms/",
    "dctypes": "http://purl.org/dc/dcmitype/",
    "foaf": "http://xmlns.com/foaf/0.1/",
    "vcard": "http://www.w3.org/2006/vcard/ns#",
    "org": "http://www.w3.org/ns/org#",
    "prov": "http://www.w3.org/ns/prov#",
    "geo": "http://www.w3.org/2003/01/geo/wgs84_pos#",
    "geos": "http://www.opengis.net/ont/geosparql#",
    "ical": "http://www.w3.org/2002/12/cal/ical#",
    "xsd": "http://www.w3.org/2001/XMLSchema#"