What makes a great Twitter contributor in a corporate environment?

A good friend (Liya Sharif @lsharif) just posed the following question via Twitter...

What makes a great Twitter contributor in a corporate environment?

I quickly responded with the following...

Someone who shares information other people can actually use; not simply a report of what they are doing or have done.

This exchange got me thinking...

• Do you agree with my response (keeping in mind I was limited to 140 characters)?
• Do you have a better answer in under 140 characters?

I'd love to hear what you think.