Speaking of Instagram, since the fall of fffound, I've needed to rely more on Pinterest, Instagram, and Ello to find new interesting artists. But as these services/communities continue to grow, the signal to noise ratios fall and finding cool stuff to look at becomes now left to the machine.
The best recommendations still come from people so here are a couple artists to watch on the 'gram:
If you like Willem deKooning, check out Matthew Dibble.
If you like Victor Pasmore, check out Guido Bisagni.
If you like Franz Kilne or Robert Motherwell, check out Blaqk and Simek.