Actually, no services see your data while browsing. But when you click&#x2F;open a file, it opens with <a href="http:&#x2F;&#x2F;docs.google.com&#x2F;" rel="nofollow">http:&#x2F;&#x2F;docs.google.com&#x2F;</a>. So technically, docs.google.com will be able to see your data. I may add Microsoft Office Online soon.