You want students to share?
Try this!
Sign up for a Google account
Activate Google+
Create a community
Invite
SHARE
Students can share... (almost) anything ... with another individual, with a class, with their teacher, with another group, with another school, and so on. They can also leave feedback on all of this.
Teachers can share... well, you get it!
Individual work
Encourage students to share their independent work with peers
Group work
Others can comment - see comments on right
Class work
Keep a record of everything the class does
Handouts
Share resources created on Google Docs and embed class handouts. It encourages students to visit material before classes
Research
Day or night, take a few seconds of your time to post relevant material and encourage students to do the same.
H/W task - everyone to post 1 resource and comment on someone else's post
Events
These can be extracurricular, or why not turn your classes into events? Share outcomes before sessions, let students ask questions before the class and let them tell you what they want to know/ learn