A video from Stephen Downes about differences between LMS vs PLE. This is a post for week 02, interactions. The point here is that interactions in a LMS are different than those in a PLE. Of course, interactions are richer in a PLE, not discarding LMS as part of PLE.
This definition says that blended learning is about combining online learning with traditional schools to create an integrated learning experience, with some students' control over the time, place, path, and/or pace of their learning.