follow recommendations in http://tools.ietf.org/html/rfc3339 for facet timestamps
fetch guest info at startup only when we have loaded all apps and the currently active app is not null
use http://tools.ietf.org/html/rfc3339 recommendations for requesting recent data updates as well
follow http://tools.ietf.org/html/rfc3339 for data update responses
use http://tools.ietf.org/html/rfc3339 in logs too