It’s always been a favourite here at AllTwitter, and social media dashboard HootSuite continues to grow at an astonishing pace.

The platform is celebrating its five millionth signup – which represents amazing growth of one million new users in no time at all – and users across all of HootSuite’s social networks and applications have now sent a combined 1.3 billion messages in 20 languages around the world.

As impressively, HootSuite, Inc, has more than doubled in size in 2012 – the company has expanded to 290 employees in the past year – and now counts 79 of the firms in the Fortune 100 amongst its clientele. Not bad for an organisation that was founded four years ago. Not bad at all.

(Source: HootSuite.)