Wow, just imagine the implications of this. 1.8 million updated weekly, still 55% of more than 14 million active (posting in the last 3 months – not sure if I would really consider that „active“).
Imagine the amount of content, that is being added worldwide. And even more: the amount of crap content that will be part of this. Unimaginable. Increase in clutter seems certain. And just how search engines will cope, too.
Technorati has all the stats.