It is known that the main part of investmnets for ICO are from China. "WeChat" is very powerful and widespread chinese internet communication tool, so, how to find or attract investors for ICO by "WeChat"?
In my understanding - Wechat it is like Asian Telegram. I think that better to promote ICO in special groups and communities of WeChat. You can find list of most important gropus in Google and reivew this topic
https://bitcointalk.org/index.php?topic=1390372.0