Tags (or labels) have been around for a long time, and they serve a clear purpose: organizing content. The construct comes from the real world use of labels, glued or clipped onto manilla folders. In a digital world, we use tags to organize our blogs, our notes, our emails, our journals our notes, our meetings, our portfolios and so on.

We've been accustomed to tagging our content, but I feel many user interfaces have "tagged on" (pun intended) the experience of tagging as an after thought. I feel there hasn't been any standardization, so depending on what website/app I'm using, tags always seem to work differently.