<http://schema.org/description>
"When you're searching for something on Google+, you can comment on an existing post or share an item that you've found.  To date, those are the only ways to interact with a certain ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/google/2012/01/18/google-now-lets-you-start-conversations-directly-from-its-search-results/>