If you're competing in any way, building in any part of the social media space, this is an invitation to have your product copied as soon as you see any traction. Facebook doesn't need the money. It's looking for you to do the R&D.
I would guess it's more about the money than you think. Public companies have a fiduciary duty to maximize profits and investor returns. They're simply using the data that's available to them to make great investment decisions to make more money. It seems like a conflict of interest to invest in a company and then turn around and compete with them. If the end plan is to take their ideas once they start becoming succe…
The actual legal standard is much closer to “don’t rip off the company” than “you must grab onto every penny anywhere near your grasp.”
This thread has a bunch of references to court cases: https://news.ycombinator.com/item?id=23393674
The common theme is that the directors of a company have incredible latitude to run it as they please, and courts won’t second-guess business decisions as long as they are vaguely plausible.