Have a social outing coming up? Take a minute at the outset to make sure you're on the same page about what you each hope to get out of the experience. You'll have a better time, according to new research from Smith School professor Rebecca Ratner.

"Hell, no," said some on social media, of the new Amazon Key service, which grants delivery people access to your house. But experts predict that what they meant was: “Not yet. But soon, hell, yes.”

Many people feel embarrassed about doing fun activities alone. Companies that help solo consumers overcome their fears can tap into a vast and growing market.