In an article at Bangkok Post. Andrew Wood writes “the arrival of FATCA has given rise to some myths”, and:
All institutions worldwide will be required to report any US citizen’s account with a value exceeding US$200,000 (6.47 million baht) for non-resident expats. That means that if you have a bank account, the details could be sent to the US Internal Revenue Service (IRS). This may seem significant, although if Americans worldwide were acting as they should, it would be insignificant and even unnecessary.
The entire article can be read here: http://www.bangkokpost.com/news/investigation/401244/is-fatca-just-for-fat-cats-us-expats-beware