Speaking of Mad Men during the third season of Mad Men they worked to create buzz through an application called Mad Men Yourself.  The application as an avatar creator that helped you to create an avatar that made a 60s stylized version of yourself.  The site received over half a million visitors the first week.   After five years you can still use the application, and it's going strong.

Viral marketing or viral advertising is a business strategy that uses existing social networks to promote a product. Its name refers to how consumers spread information about a product with other people in their social networks, much in the same way that a virus spreads from one person to another.[1] It can be delivered by word of mouth or enhanced by the network effects of the Internet and mobile networks.[2]
What I like about p2p investing on Lending Club is the website’s automated investing tool. You pick the criteria for loans in which you want to invest and the program does the rest. It will look for loans every day that meet those factors and automatically invest your money. It’s important because you’re collecting money on your loan investments every day so you want that money reinvested as soon as possible.

Based on my initial experience of passive income, I feel real that real estate is best vehicle to build long-term investment. I live in Los Angeles and was able to cash flow my first rental property. What are you thoughts about starting out to build a passive income portfolio? I have utilized Lendingclub, online savings, and a small dividend/bond portfolio.
In 2014, ad agency Ogilvy & Mather Paris set up wifi hotspots in areas of Paris that did not have wifi connections. But to use these special hotspots, you had to select the Scrabble network, create your best word, and earn free wifi minutes based on your score. Like regular Scrabble, players could earn more points with longer words. And if you shared your words on Facebook, you got to double your score (and thus your wifi minutes).
2. Treat Passive Income like a game, cheating is using your spouses income in this game. I understand some of the premise behind this, but I’m married, my wife has an income and we have a rental house that we consider ours. I’m not sure how I would count this since we also use another part of our own home(also rental income) to pay down the Rental house.
Message: Only messages that are both memorable and sufficiently interesting to be passed on to others have the potential to spur a viral marketing phenomenon. Making a message more memorable and interesting or simply more infectious, is often not a matter of major changes but minor adjustments. It should be unique and engaging with a main idea that motivates the recipient to share it widely with friends – a "must-see" element.[22]
The sheer traffic that the android and iOS appstores host every day means that if you are able to make an app that is useful, there is probably a market out there for it. If you are able to make a hit, then the sky is the limit. Flappy bird is a great example of the success that one person can have in their spare time. The creator is generating $50,000 per day from ad revenue on his free game. 
Rebranding is the process of changing the corporate image of an organisation. It is a market strategy of giving a new name, symbol, or change in design for an already-established brand. The idea behind rebranding is to create a different identity for a brand, from its competitors, in the market. Description: There are several reasons for a company to go for rebranding. One prominent factor is t
Many entrepreneurs reading this post will realize that they may not have the means to achieve true viral growth (where they have a Viral Coefficient of greater than 1). Rather than giving up, it is worth considering a hybrid viral model. In the hybrid viral model, you make up for the shortfall in customers by acquiring those through some other means such as paid search, or SEO.

Agreed but I might consider a blended portfolio of large and small cap stocks using low cost mutual funds (I found a fidelity large cap fund FUSVX with a net expense of .035% that has also delivered 17%+ YTD gains, some are dividend some are growth stock in the fund) UNLESS you’re close to retirement. This way you get the growth upside on small cap paired with the stablilty of some large cap stocks while maintaining balanced ricks.

In 2014, A.L.S. Ice Bucket Challenge was among the best viral marketing challenges examples in the social network. Millions of people on the social media started filming themselves, pouring a bucket of ice water over their heads and sharing the video with their friends. The challenge was created to give support for fighting amyotrophic lateral sclerosis (ALS), also called Lou Gehrig's disease. People finished the challenge and then nominated the next person they knew on the social media to take the same challenge. By following this trend, Ice Bucket Challenge became a 'fab' on social media with many online celebrities such as Tyler Oakley, Zoe Sugg and huge celebrities and entrepreneurs like Justin Bieber, Mark Zuckerberg and Bill Gates participating.[76] Until September 2014, over 2.4 million ice bucket-related videos had been posted on Facebook, and 28 million people had uploaded, commented on or liked ice bucket-related posts. And about 3.7 million videos had been uploaded on Instagram with the hashtags #ALSicebucketchallenge and #icebucketchallenge.[77] The ALS association didn't invent the ice bucket challenge, but they sure received a huge amount of donation from this activity. It raised a reported $220 million worldwide for A.L.S. organisations, and this amount is thirteen times as much donation as what it had in the whole preceding year in just eight weeks.[78]

7) Never Withdraw From Your Financial Nut. The biggest downfall I see from people looking to build passive income is that they withdraw from their financial nut too soon. There’s somehow always an emergency which eats away at the positive effects of compounding returns. Make sure your money is invested and not just sitting in your savings account. The harder to access your money, the better. Make it your mission to always contribute X amount every month and consistently increase the savings amount by a percentage or several until it hurts. Pause for a month or two and then keep going. You’ll be amazed how much you can save. You just won’t know because you’ve likely never tested savings limits to the max.

I like the way you have listed the ways to earn extra income and was quite surprise that you did not make mention of network marketing, which is a way to make extra income without quitting your regular, though most people view mlm as a pyramid scheme but the real pyramid scheme is a regular 9 to 5, because you can only have one president of a company at any given time and network marketing business model to promote product that can be used is really cheap to join and can offer a substantial extra income or what do you think?
Apple maintains it’s viral appeal, with the iPhone X through their launch of the "Selfies on iPhone X" campaign. The secret to this example of viral marketing (which has clocked up over millions views both online and offline) is very simple: a product so great that it turns people into fans of the brand all on its own. People love themselves. If they have the possibility of spreading this love digitally through selfies, it’s almost a guaranteed win. The iPhone X’s brilliant selfie feature spread virally through various media forms before apple repurposed the viral content into one masterpiece, the iPhone X selfies film. As one of the YouTube comments says, “It’s the most beautiful thing I’ve ever seen”… This viral marketing through video has allowed Apple to spread key features such as their Portrait Lighting effects and their TrueDepth camera.