| Vocabulary | PLDs / Total | PLDs / Percentage |
|---|
| http://opengraphprotocol.org/schema/ | 24,516 | 39.36% |
| http://www.facebook.com/2008/ | 22,913 | 36.79% |
| http://purl.org/dc/elements/1.1/ | 21,145 | 33.95% |
| http://creativecommons.org/ns | 18,435 | 29.6% |
| http://www.w3.org/1999/02/22-rdf-syntax-ns | 4,115 | 6.61% |
| http://search.yahoo.com/searchmonkey/media/ | 2,333 | 3.75% |
| http://rdf.data-vocabulary.org/ | 2,051 | 3.29% |
| http://purl.org/dc/terms/ | 1,375 | 2.21% |
| http://xmlns.com/foaf/0.1/ | 809 | 1.3% |
| http://www.w3.org/2000/01/rdf-schema | 561 | 0.9% |
| http://developers.facebook.com/schema/ | 527 | 0.85% |
| http://x.myspacecdn.com/modules/sitesearch/static/rdf/profileschema.rdf | 506 | 0.81% |
| http://rdfs.org/sioc/ns | 483 | 0.78% |
| http://www.w3.org/2006/vcard/ns | 408 | 0.66% |
| http://opengraph.org/schema/ | 267 | 0.43% |
| http://purl.org/rss/1.0/modules/content/ | 228 | 0.37% |
| http://purl.org/goodrelations/v1 | 227 | 0.36% |
| http://www.w3.org/2002/07/owl | 219 | 0.35% |
| http://commontag.org/ns | 196 | 0.31% |
| http://search.yahoo.com/searchmonkey/product/ | 161 | 0.26% |
| http://search.yahoo.com/searchmonkey/commerce/ | 123 | 0.2% |
| http://www.w3.org/2001/vcard-rdf/3.0 | 109 | 0.18% |