Dos:
Use agenda
Use edmodo
Use limited group chat
Keep my password 
Log out immediately from class/public computers
Put password on my phone
When necessary create a separate account to friend students
Set the privacy setting in my socmed so no one can post on my wall without my permission

Don'ts:
Send personal email/chat
Let others know my password
Leave my email/chat/cloud open in the class/public computer
Friend students in my personal fb/path/soc med