Ich habe 2 Twitter Konten - eines für mich, und eines für Visionary Art. It is easy to switch between accounts, since I share theme-specific on the VA account.
If you look into communities here, it is easy to join, open a community, on the right side click join, and you are in. Also on that side you click to start a post. When you post, you have a choice: post to community, or post to blog. If you post to community it won't show on your blog, and vice-versa. What I do is post to community, then re-steem it and then it also shows up in my blog. There may be a better way, but that is my work-around - only been doing that since yesterday.
Lol - why am I telling you this? I just checked one community I am in (but have not posted there yet) and there you are! OnChainArt - and they even pinned your post!