Mute, or hide all content coming from, current twitter friend. Wrapper function for mute version of follow_user.
post_mute(user, token = NULL)Screen name or user id of target user.
OAuth token. By default token = NULL
fetches a non-exhausted token from an environment
variable tokens.
Other post: post_favorite,
post_follow, post_friendship,
post_tweet,
post_unfollow_user