Look up informaiton on friendship between authenticated user and up to 100 users.
lookup_friendships(user, parse = TRUE, token = NULL)Screen name or user id of target user.
Logical indicating whether to return parsed data frame. Defaults to true.
OAuth token. By default token = NULL fetches a
non-exhausted token from an environment variable. Find instructions
on how to create tokens and setup an environment variable in the
tokens vignette (in r, send ?tokens to console).