Smile at everyone who comes within three feet of you, says Kevin Knebl, social-media and networking consultant and coauthor of The Social Media Sales Revolution: The New Rules for Finding Customers, Building Relationships, and Closing More Sales Through Online Networking (McGraw-Hill). He believes that the Knebl Three-Foot Rule, as he calls it, is the “right way to live” if you want long-term success in business and in life. The rest of the rule goes like this—“If they smile back, say hi. If they say hi back, start a conversation with them about them.”