From what i am seeing, investments in mainstream media will be too costly and sometimes will not even give you any revenue, however for social media, not only that it is free, you can use your talent in order to advertise, since even large companies would pay people to promote their product in social media, and in our case, for ICOs, we can promote them as well, however we neee their permission to do so, that's why we have social campaigns, in return, they will pay us for the services and we'll see their coins being used, even by just looking at exchanges. Doing social campaigns for ICOs helps them a lot in the future, we should just not do it for the pay, but we should also support its cause.
There are no such investments amongst all the investments present in the real world which can not help their investors to make some very good amount of money. The only thing which carries a significance importance is that you need to have a good understanding of all the things which are associated to that investment. If you don’t know much about media, then investing in media is not a good idea.