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'Android's now better than iOS': Instagram boss weighs in on the age-old iPhone vs. Android debate
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
On the collection part: Take a look at this video or the sources linked in the description if you'd rather read. Tl;dr: about the same things google collects. Not quite as invasive, but they're getting there.
On selling: this article breaks it down, tl;dr is that they are focusing on their walled garden strategy by putting ads into apple apps.