Sorry, but society shouldn't have to bail out a failed social network for puppies.
For entrepreneurship there is already enough reward for the risk. It's not just monetary gains we're talking about. For one, you get to call the shots and that's worth more to some people than money. (http://www.paulgraham.com/boss.html)
"For entrepreneurship there is already enough reward for the risk."
Maybe that's true now, but it isn't a tautology. For example, pg has mentioned that a few centuries ago, people didn't keep the wealth they made (it was handed over to royalty), which made it so there were no incentives, which severely lowered entrepreneurship.
Society has to work at making sure the balance of incentives is "correct" (correct in the sense that that's what that society wants.) So asking about one potential way society can help increase risk-taking is perfectly valid and reasonable.
For entrepreneurship there is already enough reward for the risk. It's not just monetary gains we're talking about. For one, you get to call the shots and that's worth more to some people than money. (http://www.paulgraham.com/boss.html)