Does the prohibition on advertising include things like sponsored book giveaways?
Here's what I want to do: I have a close friend who owns a bookshop. I want him to sponsor a book giveaway. He would give me a book for free for the giveaway. I would then create a "Giveaway" sign-up page on my wordpress.com blog that identified his store as the giveaway sponsor and tell people to check out his store. A reader of my blog would get the book, my friend would have his company featured on my blog, and I would (theoretically) get increased readership. No money would ever change hands.
I have no interest (at this point) in monetizing my blog. Just trying to establish a reader base by giving something to readers. No ad plugins. Is this kind of activity allowed on wordpress.com?