Worse: You need G+. that has spy shit all over it that tracks you IRL. Not sure how they do it, but they have ways. Basically you'll login to the new account and it will already have added people you know to your friends list. How the hell does it know? People can also add you without your consent. There's no concept of a friend request. If someone wants to be your friend they just add you and that's it.
Make sure you use a fake name, maybe it just uses your real name to try to dig up info off other social media sites like Facebook or something. Just a guess though.
The way I see it:
Facebook: For family and IRL friends, coworkers etc...
Youtube: For "internet life"
Don't want to mix the two. But G+ does mix the two without your consent.
Really some day I'll have to experiment and try to figure out what G+ does to find out info on you. It may in fact be as simple as the name. Originally when I made my first google account it was for adsense so I used my real name but if I made a new account just for youtube I would just use a completely fake name.