This week, 5,000+ marketers from around the world have come together in Boston, MA for Inbound 2013 – a four-day event hosted by HubSpot featuring more than 100 keynote sessions, product demonstrations and entertainment.  The Stream Creative team is onsite and not only are we learning from colleagues representing other parts of the country and sharing a bit of our own expertise, we are hearing all about the incredible new product offerings being launched this week by HubSpot.  One of the biggest announcements happened today with the unveiling of The Content Optimization System, Social Inbox and Signals. Here’s the latest on what HubSpot platform users have to look forward to with many more details to come…