How did youtube get my picture?

[Vegangsta!]

With all the new youtube changes came my thumbnail picture and it is a picture of me and my husband, yet I never linked my youtube account to any of my other social media accounts and have never uploaded a picture to youtube. When I post a comment, I have no picture as a thumbnail, but when I am just browsing, at the top right of the page next to my screen name there is a picture of me and my husband, it's pretty creepy! How did youtube get this picture (that I have only uploaded to FB) and how do I take it down!?
**I do have a google email with the picture on there as well, but I didn't add that picture there either haha and I never joined google+!

[Joeluma]

Youtube is linked with Gmail, so if you have that picture on gmail it will automatically do it for youtube aswell.

[JMc]

If you have a profile picture for a google account then it will be on youtube. youtube is owned by google

[?]

Hello!
YouTube is linked to your Google Account (Gmail, Google+). So if you set a picture on G+, your pcture on YouTube on the top-right hand corner will show that picture.

>To remove this:
1. Go to https://plus.google.com/u/0/ > View Profile
2. Pan your cursor over your current photo
3. Click "Change Profile Photo"

Edit: Go to Gmail and remove the photo.