Yidi Xu @yidi-xu Active 1 year, 6 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, 4 months ago CourseDepartmentFaculty/Staff portfolioProjectStudent portfolio