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The name was chosen regarding the data source. The queries are not addressed at Wikipedia, but at a DBpedia (www.dbpedia.org) data interface, which provides efficient search and filtering methods. Right now the used DBpedia version is 2014, accessed by http://dbpedia.org/sparql.
Usage: In general, new markers are being loaded everytime the map view changes. In order to relieve pressure on the DBpedia server, the query is not executed if there are already markers on the current view. You can force a query by pushing an empty spot on the map until the query starts.
If no markers at all are added, it's likely that the DBpedia server is down. Please be patient and try another time.