Yidi Xu @yidi-xu Active 1 year, 5 months ago ActivityProfileSites 0Friends 0Groups 0 PersonalMentionsFavoritesFriendsGroups Show: — Everything — Updates New Sites Posts Comments Friendships New Groups Group Memberships Group Updates Yidi Xu changed their profile picture 2 years, 3 months ago CourseDepartmentFaculty/Staff portfolioProjectStudent portfolio