client.js

var ssbClient = require('ssb-client')

ssbClient(function (err, sbot) {

  sbot.friends.getGraph((err, g) => {
    // returns a list of pubs
    sbot.analysis.get(async (err, pubs) => {
      //  remove the pubs from the social graph b/c pubs are not humans
      pubs.forEach(pub => delete g[pub])

      for (const key in g) {
        const id = g[key]
        // remove the the pubs links from the ids
        pubs.forEach(pub => delete id[pub])
        for (const subkey in id) {
          // remove the links that are blocks
          if (id[subkey] < 0) {
            delete id[subkey]
          }
        }
      }

      console.log(JSON.stringify(pubs, null, 2))
      sbot.close()
    })
  })
})

plugin.js

const FlumeReduce = require('flumeview-reduce')

exports.name = 'analysis'
exports.version = require('./package.json').version
exports.manifest = {
  stream: 'source',
  get: 'async'
}

const initialState = []
exports.init = function (ssb, config) {
  const view = ssb._flumeUse('identifyPubs', FlumeReduce(3, reduce, map, null, initialState))
  return view
}

function reduce (result, [id, pub]) {
  const r = new Set(result)
  if (pub) {
    r.add(id)
  } else {
    r.delete(id)
  }
  return [...r]
}

function isPub (msg) {
  return msg.value.content && msg.value.content.pub && msg.value.content.scope !== 'ferment'
}

function map (msg) {
  // finds all the links in the socail graph
  if (msg.value.content && msg.value.content.type === 'contact') {
    return [msg.value.author, isPub(msg)]
  }
}

prune.js

function dfs (graph, startID) {
  const vistedIDs = new Set()

  function _dfs (graph, startID) {
    vistedIDs.add(startID)
    const follows = graph[startID]
    for (const id in follows) {
      if (!vistedIDs.has(id)) {
        _dfs(graph, id)
      }
    }
  }

  _dfs(graph, startID)
  return vistedIDs
}

function prune (graph, startId) {
  const ids = dfs(graph, startId)
  const prunedGraph = {}
  ids.forEach(id => {
    prunedGraph[id] = graph[id]
  })
  return prunedGraph
}

function createList (graph) {
  const keys = Object.keys(graph)
  const pubs = require('./pubs.json')
  const all = keys.concat(pubs)
  all.forEach(id => console.log(id))
}

let graph = require('./out.json')
// uikkwUQU4dcd/ZrHU7JstnkTgncxQB2A8PDLHV9wDAs is just my identiy but you can use any id that is connected to the "strongset" to start the dfs from
graph = prune(graph, '@uikkwUQU4dcd/ZrHU7JstnkTgncxQB2A8PDLHV9wDAs=.ed25519')
createList(graph)

server was also modified to replicate everyone (including non-friends/follows). This is so the whole network can be seen.

todo this you can just sets the hops and dunbar number really high in ~/.ssb/config
like so
"friends": { "dunbar": 10000, "hops": 10000 }
or just set this callback to always return true https://github.com/ssbc/ssb-friends/blob/master/index.js#L33