I confess that I am not really sure what the point of the new Starbucks policy is other than to gain some points with the political left. As long as the stories don't post and that isn't supposed to happen, people will still be able to carry their guns in the stores. From Fox News:
Starbucks says guns are no longer welcome in its cafes, though it is stopping short of an outright ban on firearms. . . .
Schultz hopes people will honor the request not to bring in guns but says the company will nevertheless serve those who do. . . .If Starbucks really wanted people to "honor" this request, they would post "no carry" signs.