LINE's very popular in Japan. I use LINE because I have multiple friends and family and business contacts there. Testing the new 360 feature now. Running iOS on a iPhone 6 Plus, LINE version is 7.1.2. Appears to work, I can find 360 content stored in my camera roll and choose it and send it in LINE. I'm curious how it's displayed on the other side. Haven't heard back yet.
EDIT: Friends say the 360 video I set ends up as equirectangular video. In other words, distorted for them. I need to do some more testing. Anyone out there accomplish this successfully? I'd like to hear about it.