if you put stuff other than music / art / etc on your blog, it becomes a personal blog. and that's fine.
just don't advertise your personal blog as a music /art / etc blog.
...wait whoops that's actually drifting off topic.
RE: pony confessions tumblr: my thoughts are +1 what Derpy Hooves said here:
Derpy Hooves wrote:it could've been such a good idea and every once in a while I see a post that I think is actually thought provoking and can do good, but instead those are lost in a sea of useless "I LIKE R34" "RAINBOW DASH IS BEST PONY EVER" etc. etc. etc.