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Article:

10 Networking Mistakes That Make You Look Dumb

Common Networking Blunders You Don't Even Know You're Making

5. You're Impolite

Unintentional rudeness is a connection killer.

Rudeness comes in many forms: lack of follow-through, obvious disinterest and the disregard of social niceties. Bottom line? If you say you’ll call, call. If you say you’ll make a referral, make the referral. Focus on present interactions and avoid simultaneous web surfing while on a phone call, or room scanning for "upgrades" during a face-to-face conversation.

Be kind. Be polite. Be present.