In my opinion the most important part of internet marketing is to define your target audience. Then use as much sources as you can to reach it! I'm prefer to start with social media, such as fb, twitter, and instagram.
Yes, as most people are in the social media. They spent their hours even their day browsing thru their phones.
It's the easy way to reach your target audience. Like just one click you can reach them and tell what your up to.
Your topic must be applicable to your target market of course.
Of course we have a good stuff through internet nowadays and it's all worth it to do advertisements with socia media. The certain idea of having this kind of internet marketing has a bigger role of spreading the good news to the people connected in the network nowadays compared from old times of web network. You have the convenient and easy ways of hitting your target like with twitter gaining more followers, tweeting and retweeting shares online will encourage more followers which booms your network that circulates the web hitting your target, due to higher impact of marketing online; not just twitter but there's a lot more.