Ontology-related online communities
From W3C Wiki
If other tools are not sufficient to find an appropriate vocabulary, publishers can (and often do) rely on online communities by asking them directly.
This is a rather effortless solution which can be really efficient in some case. However, repeated enquiries about vocabularies can easily polute the traffic and publishers should first try to find a solution on their own, e.g., by following the links and indications and this wiki page.
Description: it is a Q&A service about semantic technologies, similar to StackOverflow.
Available at: http://semanticoverflow.com/