Do you know of a successful business that needs capital for expansion? If so, you can become something of a small-time angel investor and provide that needed capital. But rather than offering a loan to a business owner, you instead take an equity position in the business. In this way, the business owner will handle the day-to-day operations, while you will act as a silent partner who also participates in the profits of the business.
The term viral strategy was first used in marketing in 1995, in a pre-digital marketing era, by a strategy team at Chiat/Day advertising in LA (now TBWA LA) for the launch of the first PlayStation for Sony Computer Entertainment. Born from a need to combat huge target cynicism the insight was that people reject things pushed at them but seek out things that elude them. Chiat/Day created a 'stealth' campaign to go after influencers/opinion leaders, using street teams for the first time in brand marketing and layered an intricate omni-channel web of info and intrigue. Insiders picked up on it and spread the word. Within 6 months PlayStation was number one in its category—Sony's most successful launch in history.
Crowdfunding is a newer way to invest, having emerged onto the scene just within the last few years. Most people have heard of sites like Kickstarter and GoFundMe, and a very similar concept exists for real estate. Developers are always looking to raise capital to fund their projects. Through the various online platforms, investors have access to these projects and can choose to invest in both residential and commercial properties. See the List of My Favorite Crowdfunding Sites.
Procter & Gamble did not offer any discounts or ask buyers to buy Old Spice, it just gave a suggestion and managed to catch the attention of consumers through the ad. Buyers might buy the Old Spice body wash without consciously realizing why they did so! The lesson is to be creative. Use social media channel to foster brand loyalty in an altogether new way.  
Using influencers in viral marketing provides companies several benefits. It enables companies to spend little time and budget on their marketing communication and brand awareness promotion.[47] For example, Alberto Zanot, in the 2006 FIFA Football World Cup, shared Zinedine Zidane's headbutt against Italy and engaged more than 1.5 million viewers in less than the very first hour. Secondly, it enhances the credibility of messages.[48][49][50][51][52] These trust-based relationships grab the audience's attention, create customers' demand, increase sales and loyalty, or simply drive customers' attitude and behavior.[50][51] In the case of Coke, Millennials changed their mind about the product, from parents' drink to the beverage for teens.[53] It built up Millennials' social needs by 'sharing a Coke' with their friends. This created a deep connection with Gen Y, dramatically increased sales (+11% compared with last year) and market share (+1.6%).[53]
Lending Club is a platform where you can lend your money to other people. You’re the bank. Each note is only $25, so you can invest $1,000 and lend money to 40 people. There are many grades of loan (from safest to riskiest) and investors earn, on average, between 5% and 7% annualized returns. For more information, check out Investing and Making Money with Lending Club Peer-to-Peer Lending and my real money Lending Club Portfolio.

However, I think for those who are willing to do what it takes, the sky is the absolute limit. As an example, I’m trying to take a page out of FinancialSamauri’s book and create an online personal finance and investing blog. It is an enormous undertaking, and as a new blogger, there is a seemingly endless amount of work to be done. That said, I hope that one day I can not only generate some passive income from the hours of work I have put and will put into the project, but I hope to be able to help OTHERS reach their financial goals.
Unfortunately, I can’t answer that conclusively one way or the other. It all depends on you, what you like to do, your work ethic, personality, etc. If you are a good writer perhaps you could write a book and make money that way. Or, you could start your own website and do affiliate marketing. Just because you are young it doesn’t mean you can’t make money doing at least a few of these ideas. I wish you luck in your money making efforts!
I have six rental units which are a good source of passive income. I don’t use a property manager because you are right…they take about 10% of your rent. There are really only 2 things that tenants call about: 1. A plumbing issue 2. Heat/Air problems. Just find a plumber and heat/air guy you can trust. I travel a lot for my primary job. When a call comes in from a tenant, I can call the repair guy in just as easy as a property manager.

But first, let’s about talk passive income! What is passive income? There are many different definitions out there, but mine goes something like this: Passive income is all about building online businesses that can work for you, that allow you to generate income, and grow and scale, without a real-time presence. In other words, you don’t trade time for money. You build something up front that can continue to work for you over time.

Look at products such as Hotmail, Facebook, YouTube, Gmail, Snapchat, dating websites, and Craigslist. They all have one thing in common: they are products that went viral. These are the ideal viral marketing opportunities as these products get better when more people use them. I don’t to discuss these properly, but it’s essential to know that they exist for a complete view of viral marketing.
Among the first to write about viral marketing on the Internet was the media critic Doug Rushkoff.[16] The assumption is that if such an advertisement reaches a "susceptible" user, that user becomes "infected" (i.e., accepts the idea) and shares the idea with others "infecting them", in the viral analogy's terms. As long as each infected user shares the idea with more than one susceptible user on average (i.e., the basic reproductive rate is greater than one—the standard in epidemiology for qualifying something as an epidemic), the number of infected users grows according to an exponential curve. Of course, the marketing campaign may be successful even if the message spreads more slowly, if this user-to-user sharing is sustained by other forms of marketing communications, such as public relations or advertising.[citation needed]