yeah, i think that's worth considering too? it does go hand in hand -- the nature of the site is to reblog, but there's also no useful privacy controls whatsoever so no one has control over whether a post is seen by Just Their Followers or by Half The Entire Site.
which like you said, is the nature of tumblr, so i dunno. maybe that means more people there go in Expecting that their posts are in the public sphere, like i do? which would make linking without permission more okay.
but if some people were considering their own blog more of a slightly more private sphere, just without the option to actually make specific posts private, that's a little more of an issue. (i mean, i saw quite a few posts labelled Don't Reblog, as a desperate attempt to make sure the post didn't get spread around, but people didn't always listen. that said, those were more often venting or personal posts rather than meta, i think.)
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which like you said, is the nature of tumblr, so i dunno. maybe that means more people there go in Expecting that their posts are in the public sphere, like i do? which would make linking without permission more okay.
but if some people were considering their own blog more of a slightly more private sphere, just without the option to actually make specific posts private, that's a little more of an issue. (i mean, i saw quite a few posts labelled Don't Reblog, as a desperate attempt to make sure the post didn't get spread around, but people didn't always listen. that said, those were more often venting or personal posts rather than meta, i think.)