Is your Digital Marketing working?

Is your digital marketing working for you? Are you getting the expected results? What channels are you using (Google Search, Google Display Network, Social Media, Social Media Ads (FB,TW, IG etc)? Are some channels working better than others, if so which ones? How do you track your return on investment? Lots of questions, please answer as many as you can... lets share and learn from each other...feel free to add other relevant comments/questions. Thanks in advance...