Social video start-up Seesmic has acquired Twhirl, a desktop client that allows users to connect with text messaging social services like Twitter, Pownce and Jaiku sans browser. Seesmic will use Twhirl to enable video conversations. Twhirl creator Marco Kaiser will be joining Seesmic. The service will remain free to use.

This should make Seesmic’s founder and CEO, Loic Le Meur’s participation at this year’s EconSM even more interesting.