"Don't rely on just 1 platform as much as possible"

Look at Zynga => they relied on FB

Look at Angry Birds (initially) => they relied on Apple

Look at Moz => they relied on Google (scraping rankings)

Look at Xobni => they relied on Microsoft

Look at Rapportive => they relied on Google/Gmail

Look at TweetDeck (before acquisition) => they relied on Twitter

It's not black and white. Sometimes you just get unlucky. Sometimes you get lucky.