Suggested by TimBL:
foaf:status a rdf:Property;
rdfs:label "status"; rdfs:comment """
A string expressing what the user is happy for the general public (normally) to know about their current activity. mood, location, etc.
(Equivalent to those used typically in facebook, twitter, etc, where they are sometimes limited to 140 characters. This string should ideally be concise but there is no formal limit on its length.)
Transparency declaration: Danbri demanded a 5 euro bribe to include this one (as a testbed for transparency issues). The agreement was that the property would be added in 2009 so the bribe should be returned :)