Bitcoin is the first practical solution to a longstanding problem in computer science called the "How do I get cheap PR for my company" problem.
I haven't even heard of the companies that have begun accepting BTC, including Overstock.com.
It is only the people with vested interest in BTC that are celebrating every adoption and making a big deal out of everything BTC related, in my opinion.
/* What is App.net?
App.net is a network of social applications: App.net users can use their account to access hundreds of different applications available on a variety of platforms including Android, iOS, Mac, Linux and more.
Currently App.net users can access microblogging, broadcasting via push notification, groupchat, public or private chatrooms, photo sharing, journaling and more.
For developers, App.net offers a robust API and a variety of open source libraries and tools.
App.net is supported by offering paid services to the people that use it, rather than by selling advertising. Unlike other services, App.net users own their content. We believe that there is room in the market for a service that benefits financially from building things that people are willing to pay for. */
Its a network of networks which you can use to build your own network. Not being pedantic or sarcastic, that is what it says in the description. I guess the issue people have is understanding why this would be useful. I'm not sure why, but I'm probably not their target customer.
There are some entirely new business models that Bitcoin enables, and IMO those may deserve some attention. This, however, is far from one of those cases.