"Tagging" is a social feature that started on Facebook. It involves linking a friend's name and profile to a photo, post, or comment on a social network.
Facebook tags
In the beginning, you could only tag on Facebook with photos. But now you can incorporate tagging into almost any type of Facebook post.
A tag is essentially a clickable name that appears in the caption of a photo. When you hover your cursor over a photo that has users tagged, you will see the names of those users appear over the photo (often over their faces).
That made a lot of sense when it was just for photos, because anyone who uploaded a photo could tag their friends who were in the photos, allowing them to put a name to each face.
