Find the timestamp that is located next to your username above your comment (for example: "3 days ago") and hover over it then right click and "Copy Link Address". The link will be something like this: https://www.youtube.com/watch?v=12345&lc=a1b21etc instead of just https://www.youtube.com/watch?v=12345 To be sure that you got the correct link, paste it in your browser's address bar and you will see that the comment is now the first one below the video and it says "Highlighted comment".
Instagram Saves is when a user saves a post to his history on Instagram (by pressing the save button near the like button). A lot of saves for a post increase its impression.