User blog comment:DaNASCAT/Technical Update: August 23, 2011/@comment-876022-20110824060348/@comment-8-20110824171722

The SearchDigest feature is very experimental, but one I hope will be more widely available later. For now, we want to watch how it works on one wiki. Once it's been running successfully for a while, I'll talk to the techys to see if we can add it elsewhere.