You see them at restaurants, coffee shops, even some self-service kiosks, screens asking you to add *** tip to your purchase. It's easier than ever for companies to offer these tip prompts. The ...

Plenty of guidelines govern tipping etiquette for the usual suspects: waiters, hotel housekeeping, taxis, etc. (The simplest and most exhaustive among recent lists would be this one at Uncommon ...

Touchscreen tipping prompts are everywhere. Here's when and how much to tip in various situations. Touchscreen tipping prompts are everywhere. Here's when and how much to tip in various situations.