Every year Experian publishes a Digital Marketing report and If you haven’t seen the report then I would recommend spending time going through it.
Have you thought about Cross Channel Marketing? It is the new norm. Consumers are increasingly moving between devices. They may start on a smartphone and then move on to a desktop and finally convert on a tablet.
You will see cross device conversion tracking report coming to Google Analytics soon.
There are some fascinating statistics and overview of the digital landscape as it exists today.