PREFIX xsd: PREFIX snvoc: PREFIX sn: PREFIX dbpedia-owl: PREFIX dbpedia: PREFIX foaf: PREFIX rdfs: select ?title ?group (count(?post) as ?cnt) #Q5 where { {select distinct ?fr where { {sn:pers00000028587302325639 snvoc:knows ?fr.} union {sn:pers00000028587302325639 snvoc:knows ?fr2. ?fr2 snvoc:knows ?fr. filter (?fr != sn:pers00000028587302325639)} } } . ?group snvoc:title ?title. ?group snvoc:hasMember ?mem . ?mem snvoc:hasPerson ?fr . ?mem snvoc:joinDate ?date . filter (?date >= "2012-09-08T00:00:00.000+00:00"^^xsd:dateTime) . optional { ?post snvoc:hasCreator ?fr . ?group snvoc:containerOf ?post . } . } group by ?title ?group order by desc(?cnt) ?group limit 20