global enum UserMissionActivityType {
FEEDITEMANSWERAQUESTION,
FEEDITEMLIKESOMETHING,
FEEDITEMMARKANSWERASBEST,
FEEDITEMPOSTQUESTION,
FEEDITEMRECEIVEACOMMENT,
FEEDITEMRECEIVEALIKE,
FEEDITEMRECEIVEANANSWER,
FEEDITEMWRITEACOMMENT,
FEEDITEMWRITEAPOST,
FEEDITEMYOURANSWERMARKEDBEST
}