Twitteriffic went crazy on this one…With a simple blogpost on jaiku.com, Jyri Engeström announced Jaiku got acquired by Google. Jaiku has been HOT since its beta launch in July 2006. Jaiku is an activity stream and presence sharing service that works from the Web and mobile phones. Jaiku, Ltd. (Helsinki based) was founded in February, 2006 by Jyri Engeström and Petteri Koponen from Finland.

Jaiku’s blog mentions “new user sign-ups have been limited for the time being. The idea here is to enable our team to get right to work with Google’s engineers on delivering a new, better service to you as quickly as we can instead of spending our efforts on optimizing the current back-end. Existing users will still be able to invite their friends, and those who are not yet on Jaiku can send us a request for an invitation to join.”

As GrandCentral (another smart ‘mobile next generation service’ acquired by Google in July), Jaiku will continue its service with its current closed beta user base for a while. GPhone or not, Google is once more taking mobile serious, at least the company is preparing a solid mobile OS.