There’s been a lot of discussion about the new “chocolate and peanut butter” pact that enables cross-posting between Twitter and LinkedIn. My reading of LinkedIn’s description of the new functionality is that people will have the option to selectively cross-post tweets to their status update.

I offered my thoughts here, here, and here, so I won’t stay more on this now. But there is a bigger question: What’s LinkedIn doing?

The new Twitter-LinkedIn arrangement has Twitter’s fingerprints all over it (extending to LinkedIn a service that’s already available to Facebook and MySpace users). LinkedIn hasn’t even tried to explain how this might be of use to its users–just how to use it.

LinkedIn is six years old, and the site looks it. You can’t even customize a font right now. Rather than focusing on add-on features, the company would do well to look at its core usability and the customer experience. Sure, they don’t have a lot of competition right now–but would you want to bet your business on the market environment maintaining the status quo?