Is it possibe to edit flexifilter items later and have posts update

Issue Summary

Basically, I want to be able to put text into a post which can be updated across many posts with a tag:

Example:

and lets say i had this tag as 1 and wanted to update this tag to 2 across all pages.

Right now I have to edit the pages in order for the text to update, is there a way to do this in flexifilter, or is there another way to do this. I would prefer to have an administrative interface for this, but it is not totally necessary.