Comment to someone you haven't ever interacted with before. Afterwards, leave a comment in this post with the equivalent of "I did it!"
It doesn't have to be anything complex - it can be feedback for a fanwork or discussing something you might have in common or even simply admiring their icon. The point is to reach out to someone you normally wouldn't and connect with them, even if it's only for the briefest moment.
So - I did. This is what I posted on someone who always posts a lot of James links -
Just to say Thank You very much for all the links - even though I never comment, don't always follow the links, but I always read the post ... Thank you.