I am using following queries to get UserInfo, One of the options available is ScreenName. However, ScreenName is null for all UserIDs.
var User_Info = from user in pubTweetCtx.User
where user.Type == UserType.Search && user.UserID == q.IDs[i]
var User_Names = from user in pubTweetCtx.User
where user.Type == UserType.Lookup && user.UserID == User_IDs