DB query to delete stream items for specific user

Can you guys help me out with a database query that i can run inside phpmyadmin in order to delete the EasySocial stream items for a specific user id ?

We are in development process and we generated a lot of stream items with a specific user and we want to purge those items all-at-once.
Having to delete them manually takes ages since we are dealing with couple of hundreds of items.

Thanks in advance for any tip !