Hi Amy, thanks so much for reading and the question!

In my opinion, I’d focus on one platform at first to get the ball rolling and then jump to other platforms if you think the audiences overlap!

I spent my first months of writing developing my own blog, and I eventually syndicated some of my top articles over here on Medium. I actually haven’t expanded my syndication efforts outside of that in any serious manner since these 2 platforms are enough for me to handle already :P

Just my opinion! I’d rather rock at 1–2 platforms than focus on several, but there are people I’m sure who have strong followings in many places. Best of luck!