Hi all,
I am wondering where do you advertise your ICO projects? Do you use bitcointalk forum or other mediums like Facebook Ads or Google Ads?
Is there anyone with experience in this subject? I want to know what is the best (cost effective) medium to promote ICO.

Depending on your target audience. Google is very expensive. Facebook is mostly inneficient, but cheap. Signature campaings are good because they reach the people who are interested. Twitter has to many false accounts.
Airdrops are fine to create awareness.