Just one to add to the tips already given and that is check out the telegram group. First if there is no telegram group, then it is a no go for sure. Second if there is a telegram group, check the size because often times that indicates how many people will spend on the ICO. There could be some bots present, but there is nothing you can do at that point.
Sorry but telegram followers/participants is something fictitious
Many ICOs if not all of them are "paying" in many ways for having the telegram group increased in number
Check something yourself, in a "big" number telegram group join and check how many people are writing continuously and simultaneously excluding the admins