TechCrunch: Social-magazine Flipboard said it has more than 70 million monthly active users. And it looks like that is not the only recent bump for the startup: It appears to have quietly raised another $50 million in funding. Documents that the company filed in Delaware provide the details. On June 29, Flipboard authorized $50 million in a Series D, with stock priced at $2.2057 per share over 22,668,540 shares. This is an authorization to sell stock, but it appears that the money has already been raised. “