You shouldn't blindly trust Secret. However, I've seen a good number of things on it that turned out to be true. Since this was proven to be half true, it's possible the rest is as well. Don't bet money on it, but also don't be surprised.
That being said, I'm not sure who would be able to AND want to buy them -- Microsoft or Google?
Anonymity can certainly enable better/more information but the anonymity of it makes it substantially harder to take seriously. You'd probably need persistent IDs and a track record. But then it gets trickier to remain anonymous.
The "Square getting acquired" rumor seemed pretty baseless, by comparison.