There are many different types of learning platforms such as Adobe Connect, Cisco WebEx, padlet , SMART AMP, Blackboard Collaborate, GoToMeeting, Google+ Hangouts, answer garden, thinglink, tackk, and BigBlueButton. I think with all the free platforms that most educators don't have to pay for this type of platform. I have used Edmodo and 3D Gamelabs to runs and collaborate with my students. My students have also used a padlet to collaborate with students from Australia. The classroom is beyond the four walls in today's World.