Here's evidence I have: Steve Anderson, one of Instagram's earliest investors and a board member, is also on our board. Just because they're not trying to make money on year 1 doesn't mean they weren't ever planning on making money.
In addition, if they wanted to build a large independent business why would the sell out so early?
What evidence do you have to the contrary?
Also, I never alleged that Instagram specifically was built to flip (although I can see little to suggest that it wasn't, although that is not the same thing), I merely pointed out that phenomena such as Instagram encourages a lot of people to enter the market with that as their motive, often enough to drown out other businesses. And that kind of behaviour was a major factor in the death of the last web boom.
Furthermore, the namedropping of someone you share a corporate interest with is generally an admission of probable bias and using it as an argument in favour of your position isn't particularly convincing.