Ple and Web 2.0 in education

Hi everybody! I make an investigation for Personal Lerning Environments and Web 2.0 technologies in educational learning. Could you please tell me some ways that you use web 2.0 technologies in your lessons and i also would like to ask if you know what a PLE is?Please tell me real exams that you have tried in your classrooms. How did your students react?

Thank you