Criteria for a Good Tweet

I came across a great blog post today (courtesy of Ragan's Daily Newsfeed) that poses five questions you should ask yourself before posting a tweet on Twitter:

1. Have I checked my spelling and grammar?
2. How negative is my tweet?
3. Am I just sending this tweet so people don't forget I'm around?
4. Is my tweet sized right?
5. Will this tweet stand the test of time?

To read the full post, click here. What do you think of these tips? Would you add or change any of them? What guidelines do you follow when engaging with your followers on Twitter?

We'd love to hear from you!