It's just sharing it with others because you think it should be read, not that you agree with the article or its content. In fact I'd prefer if the share button did NOT become a "I Agree" button, because that's one of the bigger problems with other content aggragator sites like Reddit, and Digg before it. You end up with only one type of material, the type that everyone agrees with and can circle jerk over. That's not what I want in my news or things I read. I want to read the good, the bad, and the not-so-pretty. But like others have said, if I see you share something, I just assume you want other people to read it because it's a good article, or has interesting content. I never assume the person sharing it endorses or fully agrees with the sentiment of the content though.