Does Saved Search Auto send out any email updates ? I thought it was supposed to but I may be wrong ?

If not how does one go about adding it / making it send out auto ?

and lastly I can see saved search in the admin panel, but there is no way I can add saved searches to a persons registration, and I would like to set up a bit like twiiter and facebook etc and set them up a this is whats happened in your area type saved search / how to do that please ?

Pete