Please take care of default JomSocial template since there are some inconsistencies like
- activities for creating new group have class joms-stream__time
where is all in <span> element while all others are <span><small>
- all activities use ...\components\com_community\templates\jomsocial\layouts\stream*.php while events and groups use ...\components\com_community\templates\jomsocial\layouts\activities.profile.php