Listening, addressing the gaps, commenting, curating, engaging 'networking' - not just 'pushing'.
Own one network at a time - don't feel necessary to use every single outpost - understand key audience and play there. Make it part of your life.
Don't 'do' social - 'be' social. Own it. Be brave, be bold, be authentic.
Sniff out the staged and the scripted. Get Support - you're not on your own.
Particularly with content planning and development. There are no stupid questions.