updates to linkedin user profiles were announced in september. the waiting ended as linkedin pushed user profile updates to all users. improved recemmendations and media integration lead the list of positive changes.
twitter is not inherently credible, but it enables interaction that leads to credibility. a conversation does not confer good faith by its existence. it is the first step toward a relationship. linkedin, on the other hand, presumes relationships between connections. the linkedin connection does (or should) confer good faith from the moment the invitation is accepted.