Nokia is, believe it or not, still the most used mobile platform in the world (although that position looks like it will be challenged in 2012), and Twitter has finally caved in to that enormous demand by releasing an official app for that platform, which is available now in the Nokia Store.

I know what you’re thinking: There’s a Nokia Store? Yep, apparently there is.

The Nokia app is for Nokia Series 40 devices (whatever that means), and follows the existing range of official Twitter mobile apps for iPhone, Android and Blackberry and Windows Phone 7.

It’s yet to show up on Twitter’s Download page, however.

“If you have a Nokia S40 device, you can sign up for Twitter directly from your phone, read Tweets from all of the accounts you follow, connect with others, and more,” writes Brian Frank, Product Manager at Twitter’s mobile team.

The app is available now.

(Source: Twitter blog.)