Currently I have 2.My second source income is Google Adsense.

While, I can see the premise that @Angel-Ty Lebron puts forth, is an excellent choice if you are strictly targeting 40+ year olds on Facebook; by strictly limiting advertising on both Facebook and Google AdSense you are placing limitations on your reach and target demographics.

Selling products on Amazon (Still do, private label brands), Buying stocks for the long term (still doing it), and making money off google ad sense (Still doing it).  

Dividend and interest income from owning securities, such as stocks and bonds, are usually referred to as portfolio income, which can be considered a form of passive income.Some other types of passive income are:Royalties from writing a book Royalties from a patent Earnings from Network Marketing Earnings from AdSense or other internet advertisement on your websites.

As far as Facebook advertising goes against other advertising, like AdSense or another system, it's the most targeted, and thus the best.I have a background in tech, and I've helped people spend untold thousands upon thousands of dollars in internet advertising.

When I went on a created one it worked out well, very user friendly, I got a discounted domain name, created my site in two days, but then when I tried to get Google Adsense connected to my website, I was told by Microsoft that their system cannot acceopt Google addsense.

Start a blog and get Adsense revenue or sell other people products online.

Take care of all my marketing (craigslist's ads, adsense and or click2mail campaigns).6.

Internet Marketing, real estate, google adsense?

There are basic things you can do to make money with the blogs, like AdSense... though if you have a main product, then it probably wouldn't make sense for you to do that...You could also have similar but non-competing companies pay you to advertise on the blog (either put a "Put Your Ad here" section on your blog or go out and recruit)...Another awesome idea is to put an opt-in box in the corner of your site with a call to action (maybe for a free report, or coaching, or something) and collect subscribers.