Twitter

I could use Twitter in my teaching in several ways:

Using hashtags, I would be able to find other ESL teachers to communicate with and create a PLN during my lunch period, as per this article.

I could lurk on other educators' Twitter pages to keep up-to-date on their doings.

As per this article, I could develop "critical friends."  Even if I'm not in mutual communication with them, it would be just like following a smart person's blog or reading an insightful columnist's articles.