Now that you have decided on hashtags and an account strategy for your class(es), you can start exploring all the TWITTER CONTENT you might want to share with your students. Again, just as a reminder of what a class content stream can look like, here's mine: @OnlineMythIndia. When you have a Twitter class stream up and running, add a comment to the blog here so others can learn from your content strategy!
The power of retweeting. The idea here is basically curatorial: instead of writing lots of new content for your classes (which you probably don't have time to do!), you are on the lookout for existing content in the Twitterverse to share with your students. I don't spend more than about 15 minutes per day on my class Twitter stream; I just look at the accounts I'm following and retweet when I see something my students might enjoy. The result is an abundant content stream, but the time it takes from me is just a few minutes spread out several times during the day.
Build account by account. Building the class content stream is basically the same as building up your PLN: you can start with just a few accounts that you know you want to follow, and then investigate which accounts those accounts follow and, if appropriate, who also follows those accounts. Watch the retweets, and investigate those sources as accounts you might want to follow.
Websites with Twitter. Are there blogs and other websites that are relevant for your classes? Check them to see if they also have a Twitter account. Some websites do a great job of tweeting about new content; I really enjoy Project Gutenberg and Public Domain Review at Twitter, for example, and I'm sure there are similar content-heavy sites that might be relevant to your classes!
And the main thing is just to get started! Find some really good accounts that you want to follow for your classes, and then start retweeting items from those accounts. Remember to add your class hashtag, especially if you don't have a separate class account. Use Classic Retweet Extension to easily add your hashtag to retweets.
NEXT STEP => Then, after you have built up some class content, you're ready for the next step: designing a Twitter widget.
Something Extra: If you are lucky, you will find that one crucial Twitter account that turns into a treasure-trove that anchors your whole class content strategy; that was the case for my India class when I found @WilliamDalrymple at Twitter — not only is he a fabulous author, he is also a powerful Twitter presence. I'll embed his account here so you can see what he's tweeting and retweeting these days; I retweet items from his stream every single day.