If you want to learn something new, what is your primary information source? Recently I was looking for an advice on purchasing a new HDD recorder, and found the best solution within 10 minutes. How?

From Twitter. As a relatively beginner user of Twitter, I posted a tweet (actually responded to the tweet which one of my followers posted) saying "I need to buy a new HDD recorder. Which brand should I consider?" And 10 minutes later, I was convinced with purchasing one of the brands that several people recommended me, with a good reason. 

Such new media have changed the consumers' and even business' behaviors dramatically. Person that uses a powerful SNS (the term already sounds a bit obsolete) is becoming a public entity in a sense, whereas companies and organizations that used to be more public entities than individuals seem to close doors and lock themselves in under the names of compliance and governance. Relational capital (such as customers, suppliers and business partners) of an enterprise used to be more static before Web 2.0, but now companies really need to consider the public or literally "the society" including anonymous consumers and people linked to each employee for instance, as a more important stakeholder. After all, I became a potential "customer" of that HDD recorder maker because an anonymous twitter community recommended me, without the maker's awareness.  How do you measure and manage such "stakeholder"?