It can be both a good and a bad site, depending on a bunch of things and depending on what your opinion is about the site. I go on there to write on my blog about my life as a christian and I look at motivation or inspirational posts, and different kinds of posts, like an update on a pet corgi or facts about a certain topic. I think that it is good because of those things, but it can be bad because there might be negative like stuff. I don't really come across negative stuff at all when I'm on there though.Being creative, doing artwork, and blogging are not sins, at least I think so, unless your doing something negative when doing those things. They are hobbies, things that you like to do and things that are worth occupying your time. Not anyway sinful.If you go to church, you could go and ask your pastor/reverend/ or someone you know there to see if it's really a sin, that is if you really want to know for sure.
I hope this helps. :)