Build a list in a particular niche and tell them stories. Create a bond. Build a relationship with them. It's important. Then, when you've created a bit of culture, start marketing affiliate products or services to them that you think they might like. Just be sure that you personally vet out whatever it is that you're selling to avoid complaints if the product or service falls short.
Basically, people looking to borrow money will make a listing on the site. Those borrowers are then placed into a category and given a “rating” based on their credit history and rate. You, as an investor, will contribute money to these loans and then be paid back at the predetermined rate of interest. Invest and see those monthly interest payments deposited into your account.

The appeal of these passive income sources is that you can diversify across many small investments, rather than in a handful of large ones. When you invest directly in real estate, you have to commit a lot of capital to individual projects. When you invest in these crowdfunded investments, you can spread your money across many uncorrelated real estate ventures so individual investments don't cause significant issues.
P.S. I also fail to understand your fascination with real estate. Granted we’ve had some impressive spikes along the way, especially with once in a life time bubble we just went through. But over the long term (see Case Shiller real estate chart for last 100 years ) real estate tends to just track inflation. Why would you sacrifice stock market returns for a vehicle that historically hasn’t shown a real return?
However, when you lack the money, you need time. You'll need to invest the upfront time now in order to reap the benefits of automatic income later. It just doesn't happen overnight. So don't expect it to. However, you can do this without quitting your day job. All it takes is some sincere effort over a consistent period, and voila! But, to get there, you'll need to consistently burn the midnight oil or get up at the crack of dawn. Your choice.
But when so many turn down leasing one and one-half acre for one Wind Turbine for each 80 acres, that lease certainly does not materially affect the rest of the Farm or Ranch grazing pasture and the lease pays much more than the farm crow or grazing pasture lease, just because some lawyer said the lease was too long: 30 years plus 30 year option = 60 years, and the wind turbine company has selling production/electricity contracts for the next 150 years – which is needed to obtain financing!
Deductions or losses from passive activities are limited. You generally can’t offset income, other than passive income, with losses from passive activities. Nor can you offset taxes on income, other than passive income, with credits resulting from passive activities. Any excess loss or credit is carried forward to the next tax year. Exceptions to the rules for figuring passive activity limits for personal use of a dwelling unit and for rental real estate with active participation are discussed later.
If any amount of your distributive share of a partnership's loss for the tax year is disallowed under the basis limitation, a ratable portion of your distributive share of each item of deduction or loss of the partnership is disallowed for the tax year. For this purpose, the ratable portion of an item of deduction or loss is the amount of such item multiplied by the fraction obtained by dividing:
While all employees can benefit from 401(k) plans right now, the retirement options for Americans have not been improved to suit the ever-changing needs of the elderly. One of the biggest reasons Americans can’t save as they used to is debt. At present, people are in debt even before they are fully employed. If you are in debt like most Americans, then earning passive income is more important than ever. It can help you pay down debt and generally make you more financially secure.

Wow! What an awesome list! My favorite is the stock photography because I love photography. I have had some success there, particularly with one photo I make some decent income from. I think the key with stock photography is finding a shot that is high demand. Then, find a new unique way to frame that shot. This is the reason my St. Louis Arch photo is a top 10 on both ShutterStock and iStockPhoto. Thanks for the awesome ideas above!