There are lots of cryptocurrency are created in this situation but still very some of them were interested by the people to invest so how to promote the remaining coins to reach the people to invest.
Here, on this forum. It is the best place for crypto advertisement. That is why signature campaigns are well paid because we are wearing ads, promoting ICOs and they know that they will receive a lot of investors from Bitcointalk. Win-win situation for both sides.
Social medias and some other online advertisement are very effective in terms of promoting cryptos cause we almost using internet everyday. Doing such online ads will give a lot of information and it easy to disseminate, just a simple click it possible everyone's would know.