Thing 17-Slideshare

I liked exploring Slideshare but I had looked at previously too. I wasn't able to spend much time looking at it before so it was nice to be able to look closer this time. I think it would be very useful to any classroom teacher to provide another way of learning for the students. Is there any copyright issues when using another persons slideshows? I think it would be pretty motivating for students to create a slideshow and post it in slide share for others to view.