In my opinion it's Wordpress.
If you think of your own way to make money, you'll be the first and it won't be saturated. I think the best way to make money online is to deliver...
Twitter is like link farm, noone actually care about you, they just post their links...
First you need a site, then you need a product to market :). It looks simple, but really it's not. The key to make money with internet is multiple...
For a real website you have to work hard, thousands peoples are working on Wordpress and it get's updated almost every month. For your own system...
Quitters are losers, they don't succeed from the first time and leave the online business, they lose their opportunity to try again and succeed....
Invest in Adwords, but really first you have to build a plan, how you will make money with your site :)
First work on your SEO and link building :)
Separate names with a comma.