I just posted our advertisement to Super User:
https://meta.superuser.com/a/8079/22536
Please upvote it so that it reaches the required threshold of 6 votes to get displayed, thanks!
The ad itself can still be modified, don't hesitate to bring our ideas/designs/images at Advertising on Super User (2014).
Do you know other QA site where it would make sense to advertise, potentially with a different ad?