What qualifies for "mass disseminated data" for an abbreviated briefing?
If you look a page or two earlier in the AIM in section 7-1-5(b) the FAA gives two examples:


  b. Standard Briefing. You should request a Standard Briefing any time you are planning a flight and you have not received a previous
  briefing or have not received preliminary information through mass
  dissemination media; for example, TIBS, TWEB (Alaska only), etc.


That's interesting because TIBS was just discontinued (yesterday!) and TWEB is only in Alaska  (weather.gov says it's in other states too but that appears to be out of date according to the FAA's procedures). I have no idea what they include in "etc."

Personally, until I looked into this question I always assumed that "mass disseminated media" meant your local TV station's weather reports :-)