I suppose it's something YouTube / Google inserted in order to avoid spam comments :)
No, those comments are spam and spam only.
YouTube comments used to be linked to Google+ posts. After late 2015, YouTube features are now being separated from Google+ so in the future, this should not be a problem.
You can post comments on their profile. Or you can send them personal messages by going to your inbox.
It is not possible to post a comment on YouTube without an account. Posting comments on Youtube is a prvilege you get with having a YouTube account as this also attempts to deter potential mass spammers and cyberbullies.
1. They are speaking their messed up minds 2. They are trolling
No. if you see a bad comment please delete it!
this guy on youtube who always post nasty comments on her vevo page
It's easy. First, create your youtube account. Then, find the video that you want to comment on. Right click on the video and click on "Add a comment." Type in your comments, and then click on "Post comment."
Comments critical of Google Plus are censored, and everything posted on Google is also posted on Google Plus.
YouTube can be hurtful because once you post a video sometimes you can click the wrong button that lets everyone see the video that you made but there are really nasty comments, so be careful!
To leave a comment on YouTube, simply scroll down below the video and type your comment in the comment box. Once you have written your comment, click on the "Comment" button to post it. Remember to follow YouTube's community guidelines when leaving comments.