Recently, on Meta Stack Overflow at least, Stack Exchange staff have made questions posts in order to promote projects outside of the scope of the Q&A network.
Some recent examples:
An experiment: Stack Overflow TV
Volunteer to help mentor one of 16 new graduates starting a career in programming
There have been a lot of objections to Stack Exchange staff members using the meta sites in this manner. The topics being promoted are very tangential (Essentially blog posts) and if non SE employees posted similar content they would not be treated in the same way.
This has resulted in the topics being closed as off topic multiple times before quickly being reopened again.
I think issue needs to be discussed outside the comment and answer sections of these questions so the feedback can get the proper review and attention it needs, and to give Stack Exchange a place to respond to the criticism.