preview has 107 questions with no consistent usage.
- Some refer to the OSX Preview.app (there's already preview-app)
- Quite a few refer to Microsoft Office or Adobe Reader document previews (there are already office-specific tags in use on most of the questions like microsoft-office-2010, or adobe specific adobe-reader or adobe-acrobat)
- Or video previews (could probably be tagged video)
- Or preview icons
- Or OS previews (but we have things like windows-10-preview already - speaking of deprecated tags cough)
- Or the concept of taking a quick look at a document in some cases.
You get the idea - the random usage makes it useless for categorizing questions.