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#' Directed adjacency matrix detailing the presence or absence
#' of Twitter friend/follower links between US politicians.
#'
#' Network data on whether or not 69 US politicians are
#' friends/followers on Twitter.
#'
#' @format A 69 x 69 binary matrix, with 0 down the diagonal.
#' @source With thanks to Dr. Derek Greene. School of Computer Science,
#' University College Dublin.
"us.twitter.adjacency"
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