O'Reilly has a series of books entitled X in a Nutshell.
They're called that because presumably nut shells are small things. So if you want to understand something in a nut shell, that means you're getting a distillation, a summary, a conclusion without the reasoning.
We used to call them Busy Developer Guides. Because you're busy and you just want to know how to do something.
With that windy preamble, here's the story of Twitter, in a nut shell.
Twitter is the news hub for news makers and news vendors.
Kind of like GitHub for news.
Now Facebook wants to be that, and is moving aggressively.
As before, in a nutshell.
Twitter's challenge is technology evolution, not Wall St.
Once users are excited about Twitter again, investors will forget metrics.
Summary: Make the news work better in Twitter, again and again.