Bing Lin @bing-lin Active 1 year, 3 months ago @charis-choi nice profile View ActivityProfileSites 5Friends 0Groups 1 PersonalMentionsFavoritesFriendsGroups Show: — Everything — Updates New Sites Posts Comments Friendships New Groups Group Memberships Group Updates Sorry, there was no activity found. Please try a different filter. CourseDepartmentFaculty/Staff portfolioProjectStudent portfolio