I find myself using liberal exclamation points and emoticons. I know that sounds cheesy, but I am an upbeat person anyway, so I do think that comes across online. Student evaluations reflect the fact that I am enthusiastic, so it must be getting through. Even the way you choose your sentences can make a big difference.
Such as:
Let me know if you've got questions.
vs.
I'm happy to help with your questions. It's best if you can touch base well before the deadline so we can sort through any questions before the weekend. (Our assignments are due on Sundays and I'm not chained to email on weekends!)
I like Kelly's approach too; I do something very similar and I use the information they share in the icebreaker discussion to open a dialog. Often we have side conversations about gardening, travel or other "off-topic" common interests.
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