Ask HN: Hacker's Guide to Social Media Management?

I'm a former full-time developer who's now splitting time between a folk band and consulting. As a band, we created a Facebook fan page, and have been using it to promote upcoming shows, our "Tune of the Month" Youtube series, and so on and so forth. Every fan we talk to in real life is positive both about us and about our Facebook presence, but I feel like we're leaving a lot on the table.

Specifically, we tend to wonder about:

a) Time of day / day of week to post content

b) When and how to share a post on our personal profiles for maximum impact.

c) Why some posts (that are seemingly similar or even superior to many successful posts) fall flat.

d) Whether we need to start using hashtags.

e) Best use of boosted posts (paid ads)

f) The 1001 things that never occurred to us as things to wonder about (unknown unknowns).

I'm willing to believe that Facebook management (and Youtube, and Twitter and oh-dear-goodness-do-we-need-to-get-an-Instgram-account?) is a legitimate skill, like playing music or programming. But unlike playing music and programming, good resources seem hard to find. I don't want listicles, I don't want clickbait headlines, I don't want a special offer on the now-just-$5 Insider's Guide to Social Media. I want a systematic guide (be it a website-with-many-articles, wiki, book, ebook, whatever—heck, I'd accept an active StackExchange-like Q&A forum) with data-driven, goal-oriented, rationally-conceived information on dealing with social media. Does such a thing exist?

Thanks!