Two-Way+Audio+with+Graphics

**Two-Way Audio with Graphics**
I just heard about an app called join.me. I haven't tried it, and I'm not sure if it fits this category, but it allows two way audio among multiple participants (more than 200, in the paid version). It also allows the facilitator to share his/her screen; I believe the paid version also allows other participants to share their screens. I haven't yet explored it, because it doesn't work for iPads -- although the sales person said there's some kind of iPad simulator. ... Has anyone tried this? /Pam