One cannot expect "privacy" when online, just as you really can't expect it when outside of your house (and even then, think of your cable/dish/telephone and what it might be collecting data on).
The moment you are logged on, you are being tracked and sold. There are few ways (if any) to avoid that. So, either you shrug and embrace that or, well, you unplug - because once something is on the internet, it's hard as hell to remove (and nigh impossible most of the time). Heck, I can use a search engine and find things I've done online since 1995. I can find phone numbers that go back into the 1980s and are attributed to me, as well as addresses.
So, with the internet you have to decide if you're okay with the idea that Amazon has all your credit card information stored and shares your buying habits with other companies. That even before Google, search engines filed away your IP address and all the stuff you searched for - yeah, even stuff you wouldn't want anyone to know you looked up.
Add in the fact that our government probably tracks all that and more? How many times you might have been to websites they might consider subversive? I once clicked a news link and it landed me on Al Jazeera's news page... My first thought was "great, now I'm on some list..."
But, if you have absolutely nothing to hide, and that you would rather connect to millions and millions of users with your videos - if that's important to you - then... Youtube is for you. If not... Well, just consider what the alternative might do with your data and who they might sell you to.
*shrug*
