daledotshan/liferay-portal — pull request #3 by yuhai (2013-04-16 09:21:00+00:00)
Title: LPS-34427 Not Found Site Member's Activity in "My Sites" of Activity as ...

...user group member login

After assign Organization or user Group to Site, the members of Organization or user Group to Site can't see any activities in My Sites.

Due to the members of Organization or user Group belong to implicit users and these userId can't exist in Users_Groups table. So the issue occured.