Yes.
I have two IG accounts, one for my cat paintings and another for anything else, mainly my Portugal Paintings.
I sell faa items and also get custom orders for paintings on my IG accounts.
I was wondering about the same related to Pinterest..because I just dump and then nothing.. but then a lady contacted me recently, that she found me on Pinterest and asked me to paint her cat 4 times in different positions
:))
Similar on twitter.. and LinkedIn.. seems nothing happen but I got orders from all SM so I sure that it was from that particular SM .
And Facebook is still the best..
So even if I wonder sometimes if I should drop one or two SM to have it easier, I wont because I know that all work.
So If I post, I post to FB, page and profile, 2 IG, TW, Pin, LinkedIn, and eventually all paintings will end up on ny WP blog too..
All this works. (And I dont do automatic anything anywhere, and I dont pay for anything on any of them) .... tyring and boring .. :D but works so I do it all