There is one thing that companies using services like Twitter have been unable to lock down; measurement of investment.

Sure, companies can employ someone to sit in front of TweetDeck all day, but how do the suits know what's going on?

That's where TweetDoc might be able to help. It's a service that creates PDFs out of the conversations about particular phrases or hastags.

The companies' social media guru can then print off the PDF and present it to other company members to show them how the company or a particular product is being discussed.

You can set date ranges for the tweets that the PDF stores so you can present what has happened that week or month for example, and there are also options for spicing up the look of the document with different header images.

It'd be great to keep track of the buzz before an event or a physical document of what people wanted to talk about at a panel or unconference.
You could even ask your followers to submit questions to you with a certain hastag, save those to PDF using TweetDoc, print them out making it easier to answer.

We took the service for a spin and it looks impressive if you need to combine old and new media to get the best effect.

[TweetDoc]