Last but not least, you can also earn money online by building an online community, although the monetization strategies you can pursue will vary a lot depending on your goals. You can build a community with a blog, for example. You can also build an online forum and charge people for membership. You could even build up a Facebook group and use your influence there to sell and promote products.
Drive for Uber or Lyft: If you're in a locale where you can find Uber or Lyft (or even one of the many competitors around the world such as China's Didi), you could easily make a respectable income. The hours are flexible and you can work as you see fit, making it perfect even if you currently have full-time employment but are looking to make some money on the side. 
One common way to do it is to create a niche site – a site generally focused on one type of product or sub-market – and populate the site with relevant articles, with affiliate links embedded.  One of my current challenges is to add $20,000 per year to my passive income portfolio by creating niche sites that focus on Amazon products.  Here are some good sources for products to sell as an affiliate:
High-ticket consulting or coaching: You could sell your own high-ticket consulting or coaching products from your website. You'll still need a website, merchant account, sales funnel, lead magnet and many other items. But you can easily earn a substantial amount of money from each individual customer, making it well worth the arduous setup required. 
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What an epic blog post! This is going to end up as one of the best of 2011, in my opinion. Moreover, thank you so much for featuring my blog in your top “make money online” blogs. It’s a true honor and I’m humbled to be listed with so many other great blogs within what I consider one of the best posts of 2011. I’ll be featuring your post and linking back on my blog tonight…
Multi-vendor marketplaces, like ThemeForest, can be very successful. Chose a niche and create a vendor website for it. Your marketplace could be anything, from a platform for local artists to sell their work on, to an online digital product store. Once set up, invite people in that industry to sell their products on your site. You take a percentage of their profits when items sell.

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But don't make the mistake of thinking this will be a passive source of income—you're on call whenever you have a guest and you'll always need to keep the place clean for incoming visitors. On top of just renting on Airbnb, consider offering your guests paid add-ons, like Lauren Gheysens', Royal Day Out in London, England—where she gives visitors a local's only tour of the city, complete with bespoke 18th century costumes.
White labeling products involve purchasing pre-made products from a supplier and then adding your own labeling and branding. Products could range from candles to gym equipment or even tea, but all will come without labels, allowing you to create your own new range of merchandise. Most suppliers will advertise the fact they offer white labeled goods on their websites, so pick your niche and then find the right supplier and product for you. Once labeled, products can be sold via sites like eBay and Amazon, or from your own eCommerce store (discussed in a moment).
Again, if your blog has a large reader base, then businesses may be interested in paying you to review their services or products. Not only will you get a free trial using whatever these businesses are selling, but you will also get a fee for writing them a review and posting it to your site. Paid reviews (and other paid and sponsored content) can be big money, so advertise this service on your contact page to generate business.

They often expect you to commit to working a certain number of hours per week, which is generally part-time. They will pay you an hourly salary for that work, so it is really more of an at home job situation than it is in an entrepreneurial way to make money online. Still, if you want to get involved in political activity, and you have the time and motivation, this could be a way to monetize that passion.
Français: se faire de l'argent en ligne, Italiano: Guadagnare Online, Español: ganar dinero en Internet, Português: Ganhar Dinheiro Online, Deutsch: Online Geld verdienen, Русский: заработать в интернете, 中文: 在网上赚钱, Bahasa Indonesia: Menghasilkan Uang Secara Online, Čeština: Jak vydělávat peníze online, Nederlands: Online geld verdienen, العربية: كسب المال بواسطة العمل عبر الإنترنت, Tiếng Việt: Kiếm tiền Trực tuyến, हिन्दी: ऑनलाइन पैसे कमाएँ, 한국어: 온라인으로 돈 버는 법, ไทย: หาเงินออนไลน์, Türkçe: İnternet'ten Nasıl Para Kazanılır, 日本語: オンライン上でお金を稼ぐ

17. Amazon – Have you heard of FBA? It stands for “Fulfilled by Amazon” and it’s getting pretty popular. Basically, you buy products (in bulk is best) and ship them to Amazon for them to store. When your products sell, Amazon packs them up, ships them out and sends you the money (after taking their cut). There are people making a full-time living from FBA, while others just do it for some extra money.
Do you constantly come up with witty one-liners? Do you dream of the days of Mad Men-style advertising? If you’ve got some branding chops or just come up with imaginative copy, there are lots of opportunities to make money online through company naming and slogan contests. If you think you have a knack for names check out and If you dream of coming up with witty copy, try coming up with company slogans on Slogan Slingers and Get a Slogan.

This is a browser extension you can install that will occasionally show you sponsored advertisements on your sidebar when you search. Each advertisement is worth a few cents or more. If you visit the ad shown, you receive the dollar amount shown in your Qmee virtual “piggy bank”. You can cash this out at anytime, there is no minimum. Also, the money shows up in your Paypal account pretty much instantly after you ask for it. I put this site on this list because even though it's not a big earner, you can get paid quickly.

Slice the Pie is a site I use quite frequently. All you do is listen to music and rate/review it. You'll get paid anywhere from six to seven cents up to sometimes seventeen cents per song you review just depending on if they have any promos going on. It only takes a few minutes to review a song. They pay out on Tuesdays and Fridays and you must have a minimum of $10 to withdraw your earnings, but this is very possible to do twice per week.

Eric, this list is HUGE, thank you very much! There are clearly so many ways to make money online. It’s all about choosing the method that works for you. To make some decent money — even just a dollar — one has to look at the internet in unusual ways. One cannot think of the Web as a place for entertainment, a source to use when you’re bored or some temporary time killer.
This isn’t to scare you off. I simply want you to know that this guide is going to focus solely on ways to make real, sustainable extra income online. Not just a few bucks. I want to share all the mistakes I've made that got me to where I am now so that you don’t have to go through them, and can build a successful online source of income for yourself.
Career in online marketing – This one comes per the suggestion of Ian in the comments, and rather than rewrite what he said, I’ll simply quote him: “There are two types of careers. The first one, where you have to work out of an office, is not really making money purely online because it’s a job that requires an office presence (although an absolutely amazing one and one that may still make your list). However, another route is starting your own SEM agency. If you start your own agency, you can make a tremendous amount of money from the comfort of your own home if you work hard and are really good.”

Salvage and resell. Do you love antiques or have a knack for finding valuables at flea markets or yard sales? If you do, it might be time to consider salvaging items for resale – or even scouting out antiques to sell for a profit. While you’ll need to spend quite a bit of time searching for prospects and spend some money buying upfront, you could easily turn a profit if you know what you’re doing.

Merch by Amazon is another service offered by Amazon that will enable you to make money online without any initial outlay. To get started you need to create an account with Merch by Amazon. Then simply design some T-shirt logos or slogans, and upload them to your Merch account. You will need to choose a T-shirt type, color, and price, and Amazon will create product pages for each T-shirt. When someone makes a purchase, Amazon takes care of production and shipping. And you are paid a royalty for your design.
Pinecone is one of the best survey panels out there for earning fast cash, and they pay quickly — usually by the next day — for the surveys you complete. The surveys don't come every week, but it's a nice little bonus when they do because of how fast they pay. Right now Pinecone is open, but there is no guarantee you'll get in just depending on what demographic they need right now.
Becoming a Virtual Assistant is not just a legit work-from-home opportunity – it’s a position you can build a business and career on! Virtual assistants can work with a company that specializes in outsourcing assistants to various clients or you can fly solo and set up your own VA company. Each path has its own benefits and drawbacks – for example, if you work for a VA company, they do all the work of finding you clients. But they also take a cut of what clients pay for your services. Becoming a VA is a great option if you have many different office skills – or writing skills, research skills, agenda-planning skills and more. My very first remote job was working as a Virtual Assistant and I have tons of resources on my site to help you.