Overheard lists out the most recent Twitter posts ("tweets") related to this company. Anyone, employee or customer, can convert a tweet into a community topic. Overheard notifies the original Twitter poster of the discussion started in response to their issue.
RT @wlogassistant: Should already support it but testing not completed yet - RT @irvingpop: Will be testing #JIRA 4.1 as soon as @wlogassistant supports it.