Facebook marketing/advertising is the most effective way to promote something you offer. And what's good about it is that can reach a lot of traffic and potential people who has a connected interest to your product, FB is already identifying their members interest because of information the same thing as google do it.
This is effective in the country where users are actively participating in facebook. There are some country where facebook is not that popular instead they have other platform in alternative to Facebook. Definitely FB marketing won't be effective in these countries. What I am trying to say is, do not limit the advertisement in one social media platform. Instead, make use of all the possible platform that can be use to advertise your product or service.
Marketing is very easy if you know what you are doing. You cannot spend money on advertising without a plan or project before. Especially in the internet, marketing needs a detailed plan before putting it to act. Social media marketing is the most effective to date internet marketing, together with a website with good SEO optimization. Anyone can do internet marketing but not anyone can be successful. Successful persons are those who go by a plan.
In short, for a starter, we need to know the basic of internet marketing, we can either attend a class, work camp, or read ebooks about it. Without a basice understanding of internet marketing, we cannot be successful in our venture in the internet marketing industry.