We see the most activity on Instagram and Facebook, from all ages but they're more or less different audiences.
I've managed social media, web sites/analytics, and blogs in the past and have a few freelance clients I maintain in my downtime.
I really like the following FREE user friendly tools...
Iconosquare gives you Instagram statistics (iconosquare.com) & Facebook Pages give you "insights" about interactions & your audience.
Canva makes it really REALLY easy to make promo images, post cards, etc. (
https://www.canva.com/)
You can see if there's a "Social Media Breakfast" in your city - it's not just for people who work in social media or digital/creative jobs but also good networking and advice.
My biggest pieces of advice are: to try to find a balance for # of posts; be personable & try to be unique.
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