User blog comment:Oldguy22/I cannot publish/@comment-5244332-20141128022544

1) You don't lose any units

2) If you are transferring platforms (eg. iOS to android) your gems WILL retain at the old version. It is highly recommended that you use all your gems in the old version before transferring to another platform.

3) You can

4) Facebook app is recommended.

5) No

Footnote: Don't be a douchebag and spam vulgarities. It is not an entitlement to have your questions answered so be nice. Thank you.