There have been a few related discussions, but you may want to consider creating a new idea for this so that others can vote (and give Jive a better sense of how much demand there is for something like this.) Thanks!
Meanwhile, as a work-around you may want to perform a search on "Axure" with the advanced search tool, setting up the customized settings as you wish (restrict to a certain community or not, sort by date, etc...) and then copy the RSS link at the bottom of the search result ("RSS feed of this list").
Now either just subscribe to that link in your preferred RSS reader, or even add a Syndication widget to your Jive personalized homepage that would only display this feed. You'd then have an up-to-date feed of every content mentioning Axure.