If I have a choice of investing in a blockbuster cancer drug that will pay me nothing for ten years, at best, whereas social media will go big in two years, what do you think I'm going to pick?
If you can't get the thing properly patented, you're not going to fund it with social media in or out. The trouble isn't social media, it's that monetization is a really limited incentive within an industrial society where lots of great ideas fall into the category of public goods or reduction of externalities that just aren't incentivized properly and hence never get realized.
Say you come up with a great project to revolutionize education, health, energy or transportation - it might be to disruptive for governments to fund it (assuming there's a budget), but if there's no way to exclude non-buyers from benefiting, you're not going to get private funding either.
If there's revolution of thought within this century, I'm predicting it'll be in economics. I'm fine with a market economy for consumer products, but it shouldn't be the only game in town.
No problem is so large it can't be fit in somewhere.