Nah.. gaining 30 million users in a month is hardly because of advertising. It definitely helped because new Android found out about it's availability, but the fact is that they were at a specific number on iOS and weren't moving this rapidly. It only happened when they came out on Android. It's more of the fact that sheer number of Android users wanted it and bam, this is what happens. It's a case study on why Android is far better platform for developers and popularity of startups.
I mean seriously, they more than doubled their users in a month that it took them 18 months previously. There is no advertising and good press that can shift these numbers this much.
First off, that reasoning of yours was argued and proven many times opposite in another " coming to android" thread you created.
Also FlipBoard has been requested to be Android since FlipBoard came out, if your reasoning was correct, it wouldn't be an exclusive for the Gal SIII, and it wouldn't be for " select Android ". It would have been out concurrently with the other versions.
And above all it is from advertising that it has it's popularity, the advertising of " word of mouth ". The many and many of people since FlipBoard came out it has been requested ( it's just about on every App to Get list, as well as Android App Request list ), it is just now coming out, as an exclusive. Which to me at least, says that they didn't care enough until somebody wrote a fat check.
As far as moving this rapidly,, you do realize that when one of the most requested apps on mobile's comes to another platform, it's expected it's not going to be slow. Because many people have been waiting for it from the start, as well as the Word Of Mouth Advertising and recommendations from Websites reviews. So yes it's userbase is going to jump rapidly, but from the apps quality, not androids, as it could go to PC/OSX and it would still jump higher then when it first came out for iOS