This Post is not answering the Question, merely expanding (?) on it,
In my opinion, is Facebook is becoming more and more relevant. Shopping carts have to have a Facebook presence.
My reading tells me you should post at least twice a week and four times before posting a buying post, its a lot of work. Schedule post are there but you (me) need to build up a following so I am posting currently to Groups to build up Followers. Scheduling posts to groups is still a mighty challenge . . .
There are a number of offerings out there that promise the World and a rapid increase in followers and schedule postings but very few have a researched reputation, those that do, are for me, very expensive ( our currency is weak and getting weaker ) this is similar to the people selling links for website authority
Also I am reading that Instagram is becoming the new facebook ?
Again, in my opinion, it is very important that my websites can interchange to my Facebook page , I have achieved this using this tool from facebook : https://developers.facebook.com/docs/plugins/page-plugin
It generates some interesting code, similar to an Ifame that I have put into the Fly-Out from one of Anne's : picaflor-azul templates, I am of the opinion this generates more authority and trust.
If you interested, go take a look, fridgeschool dot co.za or solarfarm dot org.za both websites offer a service instead of a product. One website that I have selling products is due for and upgrade that I will be considering the facebook integration very carefully during the upgrade.
Its totally off topic but i feel I would be in remiss if I failed to mention that all my website I have had success with WhatsApp
Andy