ANN threads are effective for sure. But i am not sure about bounty campaigns. There are so many bounty hunters they open useless social media accounts to get more free tokens. A more professional advertising strategies are a must for icos.
There are difderent ways in promoting a project, it depends on what tbe project is. But the best option of.promoting a project is thru posting is social media networks since there are many people who can see the project with thjs.