The document discusses the benefits of teachers developing their own personal learning networks (PLNs) using social media tools like Twitter. It notes that over 100 language teachers from around the world connect on Twitter to share ideas and resources. Through their PLNs on Twitter, teachers find out about professional development opportunities and get guidance from influential educators. The document also references a 2011 quote from Joe Dale emphasizing that there is a strong, supportive community of teachers sharing ideas and resources on Twitter.