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Article:

11 Social Media Mistakes You Don't Even Know You're Making

These Social Media Blunders Could be Hurting You Personally & Professionally

9. Lackadaisical Social Efforts

Rather than try to be everywhere at once, be selective with your time and network choices.

Having a profile is like turning on a porch light. Non-responsiveness -- "Sorry! I never check that account!" -- sends a message. You may inadvertently communicate a lack of follow through or a lack of respect. 

Similarly, an account with outdated information and an old photo, or even worse -- a grayed-out avatar -- indicates half-hearted involvement. Your public profiles should display energy and professionalism, not tepid indifference.