title: Plot network using ggnet2
body: <p>I have a network that I created by importing a gml file.
  If I plot this network using <code>plot</code>, nodes have the correct label (string).
  If I try to do the same thing using ggnet2, the labels become numbers.
  Why?
  This is my code:</p>
  
  <pre><code>   library(igraph)
     library(poweRlaw)
     library(sna)
     library(ggplot2)
     library(GGally)
     library(ergm)
     library(intergraph)
  
     net &lt;- read.graph("./network.gml", format = c("gml"))
  </code></pre>
  
  <p>plot(net)
         netb &lt;- asNetwork(net)
         ggnet2(netb, size = "degree", label = TRUE)</p>
  
  <p>The results I get are:
  <a href="https://i.stack.imgur.com/OMMCP.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/OMMCP.png" alt="enter image description here"></a>
  <a href="https://i.stack.imgur.com/I4yjH.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/I4yjH.png" alt="enter image description here"></a></p>