But by the time the exchange publishes the news, it is late to participate
I don't think so, the top exchanges only increase trading volume and liquidity. I agree more with @Psynthax, the figures and partners involved are more dominant in influencing project exposure, they will publish news and tweets everywhere.
The project exploded does not guarantee the price will increase even if it is listed on the number 1 exchange. Many people including AMA participants were disappointed because of this.