questions about building community with technology

On Wednesday this week, I will talk about building community with technology to pre-service teachers, could you offer me some suggestion about:

... if you could share "just one thing" about building community with techonology with them, what would you want them to know or be able to do?

What issues do you think should be considered when develop and maintain a community for their students

What do you find most compelling and important in building community using techonology?

What tool is most critical to know?



I look forward to hearing what you all find valuable!