I wrote a little Android app (Stack Flower) that allows customized searches of Stack Overflow. If the user clicks on one of the results, the app then displays the relevant post in a WebView. I thought that this was fine, especially since there are several other apps that do the same thing, but now the Google Play Store is demanding "verifiable documentation" indicating my rights to use the content in my app.

As I understand it, Stack Exchange welcomes projects that link to its content (hence the Stack Exchange API and this Stack Apps subsite). However, I can't seem to find an official statement saying that it's okay to link to Stack Overflow from within apps, even though the answers to questions like this and this strongly suggest so.

The API Terms of Use say that "Stack Exchange Inc. logos, branding, and other copyrighted content returned by the API may be used unmodified for the purposes of identification (ie. identifying content on Stack Overflow with the Stack Overflow logo). Other uses of Stack Exchange Inc. content are subject to the Stack Exchange Trademark Guidelines." The Trademark Guidelines then state that all user-generated content is subject to a Creative Commons License, which also seems helpful. Still, it doesn't directly state that everyone's permitted to link freely to entire Stack Exchange pages.

So I'm asking for explicit clarification that it's permissible to link to individual question/answer posts from within an app.

I realize that my position here is precarious, since there's now an official Stack Overflow app for Android (which was announced here about a week after I released my little app). If the official app offered better search customization, it would make my own app obsolete, and I'd willingly delete it from the store myself. But until then, I think there's a niche for an app that provides better search customization, and I'd like to keep my app alive.

All I ever wanted to do was provide a useful little tool. Please help me if possible!