I still remember the early days of Twitter. Well, sorta’. I got on in 2007, after the SXSWi hype-storm that year introduced it the tech world. And it was a different place then: replies were invented by users, and you could see all of them; a 100 followers seemed like a lot!;  and no-one outside of the geek world knew what it was. But times have changed. And now, the fine folks at Edison Research have just released a report showing how much. Their “Twitter Usage in America 2010″ contains some some pretty fascinating facts about everyone’s favorite microblogging service. Here are some of the highlights:…