These functions allow you interact with information about a Twitter
user - retrieving their base information, list of friends, list of
followers, and an up to date timeline.
The getUser function returns an object of class
user.The lookupUsers function will return a list of user objects,
sorted in the order of the users argument, with names being the particular
element of users that it matches to. If the includeNA argument is set
to FALSE (default), any non-existing users will be dropped from the list.
Details
These functions will only return fully formed objects if the
authenticated user is allowed to see the requested user. If that
person has a private account and has not allowed you to see them, you
will not be able to extract that information.
The lookupUsers function should be used in cases where there are
multiple lookups going to take place, to reduce the API call load. This function
requires OAuth authentication.