by: Mathew Ingram | gigaom.com

One of the characteristics of the modern media age — at least for anyone who uses the web and social media a lot — is that we are surrounded by vast clouds of rapidly changing information, whether it’s blog posts or news stories or Twitter and Facebook updates. That’s great if you like real-time content, but there is a not-so-hidden flaw — namely, that you can’t step into the same stream twice, as Heraclitus put it.