| Vocabulary | PLDs / Total | PLDs / Percentage |
|---|
| http://opengraphprotocol.org/schema/ | 96,666 | 40.02% |
| http://www.facebook.com/2008/ | 96,508 | 39.95% |
| http://ogp.me/ns | 54,362 | 22.51% |
| http://www.w3.org/1999/02/22-rdf-syntax-ns | 36,207 | 14.99% |
| http://purl.org/dc/terms/ | 30,058 | 12.44% |
| http://xmlns.com/foaf/0.1/ | 26,925 | 11.15% |
| http://purl.org/rss/1.0/modules/content/ | 23,128 | 9.57% |
| http://rdfs.org/sioc/ns | 22,600 | 9.36% |
| http://creativecommons.org/ns | 14,170 | 5.87% |
| http://purl.org/dc/elements/1.1/ | 11,383 | 4.71% |
| http://ogp.me/ns/fb | 10,378 | 4.3% |
| http://www.w3.org/2000/01/rdf-schema | 9,184 | 3.8% |
| http://rdf.data-vocabulary.org/ | 8,603 | 3.56% |
| http://www.w3.org/2004/02/skos/core | 7,571 | 3.13% |
| http://rdfs.org/sioc/types | 3,884 | 1.61% |
| http://search.yahoo.com/searchmonkey/media/ | 2,737 | 1.13% |
| http://purl.org/goodrelations/v1 | 1,638 | 0.68% |
| http://www.w3.org/2006/vcard/ns | 1,410 | 0.58% |
| http://opengraph.org/schema/ | 1,030 | 0.43% |
| http://developers.facebook.com/schema/ | 917 | 0.38% |
| http://www.w3.org/1999/ | 531 | 0.22% |
| http://mixi-platform.com/ns | 352 | 0.15% |
| http://commontag.org/ns | 191 | 0.08% |
| http://www.w3.org/2003/01/geo/wgs84-pos | 159 | 0.07% |
| http://www.w3.org/2002/07/owl | 156 | 0.06% |
| http://search.yahoo.com/searchmonkey/product/ | 151 | 0.06% |
| http://purl.org/stuff/rev | 145 | 0.06% |
| http://opengraphprotocol.org/ | 125 | 0.05% |
| http://ogp.me/ns/ | 111 | 0.05% |