How is it not good news? I don't think anyone thinks it's a hugely important event or Billie's a hero or anything but it's cool and positive that social media can make something good like a dog being reunited with its owner happen just with a few simple "Hey if you live in the SF area, please look out for this dog, ok? bye" messages being posted. Just an example of the good social media can do which is made slightly more interesting by a celebrity having been involved, a harmless feelgood story.
Also my lost cat was once found because of kind people on Facebook which was amazing so I find this extra cool