You are correct when you say i am RESHARING, but you are wrong when you say i am resharing other people's content. Facts are not anybody's content.
Suppose i reshare a fact that Earth is round (some people disagree with it but still) or Earth has one moon or Saturn has 82 moons or an egg shell is white or it is impossible to lick your elbows, do i have to reference the source for each one of them?. They are FACTS. if i am resharing them i am not stealing anybody's content.
One new thing that has come to my knowledge through your comment is that esteem isn't for resharing. Facebook and twitter are. Nobody told me this when i signed up for steemit anywhere.