2 ways to reduce tag cluttering
One of the biggest issue with the use of tags is the fact that their users have the tendency to create a large number of items to describe the content and in the end you will end up with a unique tags for each piece f content they are creating.
In general this happens because the users forget their previous tags.
Wordpress has tried to limit this behavior through 2 elements:
- autocomplete: once the user starts typing, the associated tags will start to appear eliminating misspellings and guiding the user to previous tags
- most popular tags: this appeals to the lazy user that writes about the same content periodically. Replacing typing with mouse clicks is a winner

