FACEBOOK OEKAKI (and deviantart)

Okay so once again I've realised that I'm an admin at oekaki's facebook page and I have a moral dilemma.

Occasionally, I would like to put some of your works there. If I've chosen your work, you'd be promoted and it will increase oekaki's appeal. You know, pre-zin campaign. The dilemma is that I'm not certain of my rights to use your artworks... And screw the law, I think by law I can use your works anyway, as long as I don't get paid for it and I don't delete your credits - but It's your opinion, about which I care. So what do you think?

I used to think I'd never put any of my works on Facebook, and I'm still not sure about it. But the truth is Facebook will never take away your copyrights (whatever they have written in their terms of laws) and a lot of people put their work on Facebook, because of the wider audience. I think many of the viewers use only Facebook. Since the only working application on my phone is the Facebook App I had been checking this site only when I hadn't connection to the internet on my computer ;( So I had seen artworks from people, who are self-conscious enough to have their own fan page.

TL;DR LET'S GO BACK TO THE TOPIC:
I can't always get in touch with with person whose work I want to use. Can I use it anyway?
Do you want to get promoted in such way?
Do you have a fan page?
Why other fan pages are so popular, and you still don't have one, even if you're better?

Oh, kisses for people who don't have Facebook :*