In the last four hours, I've gotten three instances of this email:
Subject: Done any cool projects lately? Add it to your Careers profile!
Thanks for being a member of Stack Overflow Careers!
We noticed that you haven’t edited your profile in a while. Have you changed jobs, written any blog posts, contributed to any open source projects lately? Update your profile to ensure employers can easily find you.
The Stack Overflow Careers Team
I could swear I've gotten even more than that, but I'm not seeing them now.