The IRS gives more specific limitations as to what it means by “material” participation. For one, it includes if you worked at least 500 hours in a year on the project or more than 100 hours when no one else works more than you. Additionally, if you do at least almost all of the work in an activity, it’s considered material involvement. Even the combination of your work in multiple significant participation activities (SPAs), if it exceeds 500 hours, counts as material participation. There are a few more criteria that would qualify a project as material. You only need to meet one to qualify.
Some investments, such as certain notes, T-class units of mutual funds and REITs, pay a mixture of income and a return of capital. A return of capital is not included in income in the year received; rather, it reduces the adjusted cost base of the investment and increases the capital gain (or decreases the capital loss) on the future disposition of the investment.

Because passive investors’ rentals are viewed as secondary income, they can only deduct the normal costs associated with their rental properties. They cannot deduct any home office expenses and are limited on how much they can deduct from any losses they might incur. As of 2010, you can only deduct up to $3,000 from your other active income like your job or employment.
One of the things I'm surprised your article doesn't mention is the tax advantages of this type of investment. The depreciation and rehab costs (purchasing distressed properties) can be huge deductions to ones income taxes, which none of the others have. Then, along with the appreciation of real estate, this passive income investment outperforms the notion of maxing out my 401k as well.
You may already know there is a difference and you may know generally what that difference is, but it’s likely you don’t truly grasp the implications of those differences. For the record, there is nothing wrong with either of them. But if you want to maximize your returns down the road, you do want to make sure you really do have a solid feel for how these two differ.
I also noticed that in your passive income chart at the bottom that you don’t include your internet income other than sales from your book. Is there a reason for that? Do you not consider is passive because you are actively blogging all the time to create it? Or do you just not want readers to know how much money you generate from blogging activities?

Haha, that is too funny. I wanted to make an app back in the day called “MyShares” (You can probably tell how I cam up with the name at the time). The idea was that I would loan out books and DVD’s and then would never get them back. Then I thought, how cool would it be if I could rent those items out and that would motivate people to bring them back. Obviously, books and DVD’s are cheap, so this isn’t the money maker. The idea that would probably make the most money would be things like tools, ATVs, etc.