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Adding a description field to Twitter list creation is a simple change which has rolled out today, but it’s a useful one.

Not only does it allow you to provide context to people who will view your list (Without creating a list title as long as a book), but presumably it will also be indexed to be searchable, enabling better list discovery. At the moment I’m seeing a huge number of lists created, often with plenty of duplication of topics and titles, and very few followers for each one.

A searchable description field aids this somewhat, although it may mean there’s a land grab to be the first with the best description for a topic – and that there will be consolidation around lists, with a long tail distribution curve in effect.

But it also shows that the evolution of Twitter is continuing, and the team aren’t about to take a break after rolling out Lists and the new Retweet feature (the Beta trial has just reached my account, and I haven’t really reached a conclusion about it yet!)

Given that the Suggested User List is being radically overhauled, user lists and descriptions look set to play a more prominent role in the Twittersphere, and the real-time web it inhabits.

I may have already written about Twitter lists, but certainly the interest in them hasn’t started to wane yet.

In addition to everyone and their blogging dog creating posts on the lists you really, definitely, absolutely should follow,  Mark Drapeau has an interesting post on O’Reilly Radar, in which he puts forward the idea that Twitter lists are a more organic metric than the number of followers/RTs an individual has.

Meanwhile the two rivals for most comprehensive Twitter client, Tweetdeck and Seesmic, have both revealed the imminent inclusion of list functionality:

‘While we’re not saying exactly how we’re integrating lists just yet – hey, we all need a few secrets! – be happy in the knowledge that we are integrating lists into TweetDeck. And as you would expect, we’re not just planning any old run-of-the mill integration…oh no. We think you’ll find that what we have planned for Lists is going to take your social media experience with TweetDeck to new heights.’ - Tweetdeck blog.

‘OF COURSE Seesmic will have user lists very soon. I have them on my Seesmic Desktop already testing.’ – Seesmic founder @Loic on Twitter.

I’m convinced Twitter lists will remain a highly important change for Twitter, both for users, and for monetisizing the business.

With about half of Twitter users able to access Twitter Lists as they’re rolled out to everyone, independant Twitter list directory Listorious has been quick to launch and offer curated lists on a range of topics.

It’s interesting to see whether the relatively peer-led recommendation of Twitter lists will displace directories of individual users grouped by category such as WeFollow and Twellow. Obviously there are concerns about both the follower-inflation that everyone has seen from the Suggested User List presented to new users, as well as individuals worried about being pigeon-holed and lists becoming reciprocal favours rather than recommendations.

It’s also likely to diminish the value of the longstanding Twitter tradition of #followfriday.

From a business point of view it makes utter sense for Twitter to have some input/control of listing users – all the examples above have been relatively successful. What’s the betting that an option to promote a specific list could be in the monetisation plans? Spend some cash and your list could be promoted to everyone, or possibly replace the Suggested User List for a period of time?

Suddenly they’d have a route for grabbing sums like the $250,000 offered earlier this year by Jason Calacanis, without it being flagged up as obvious in a list of just 20 or so people.

And obviously list pages themselves offer individual sponsorship/promotional oppportunities…

As a user of Twitter, I’m undecided whether lists will be a positive thing on balance, but as a Twitter observer it’s one of the biggest steps they’ve made in a long time towards making money.