I scanned an article out of a magazine and emailed it to 15 people in my office. They might send it on to a few dozen more people.
The magazine could freak out and call me a thief.
Or, they could be excited that I just advertised their publication to a bunch of prospective subscribers, for free, with my personal recommendation. I hope they get some new subscribers.
(There is a line. If I re-published the article on my blog or copy the work as my own, that would be copyright abuse. But reasonable sharing is good for everyone.)
How are you making it easy for your fans to share some of your best stuff?