Welcome! It took me a bit to learn, and I still learn new stuff now.

It seems like there is so much more continued interaction on here than on Twitter.

you'll like it here. It's a nice community.

Yes thebluestbutterfly Plurk is about conversations, Twitter is about broadcasting what you're doing. They are very different.

how do you keep up with the conversations where you are responding to others?

when someone says something in a conversation the Plurk gets flagged. You can then go to it by clicking the response button on left.