I am doing marketing compaing for 1 of my clients and our next step is to do series of youtube giveaways. The niche is baby, so basically we need moms who do videos on youtube. What's the best way to find those? Also what is the difference between user and channel? And how to choose the best ones? The more subscribers the better?(kind of ALEXA for youtube?) Complete noob when it comes to youtube, Thanks!