Twitter recently made a change where you will not see any tweets from folks you follow if they start with a @username that you are also not following.
This means that if you start a tweet with @username, only your followers that are also following @username will see it the tweet.
Personally, I like the feature. But some folks don’t. So here’s how you can easily get around it:
When replying to someone, don’t start your tweet with @username.
What I typically have always done when replying to other tweets is:
1. retweet, …

Every parent of tweens+ read this RT @starbulletin: Local Teenage girl lured over Internet http://tinyurl.com/bv8ny8

Busienssweek on Kindle echos my yesterday tweet: iphone kills Amazon kindle hardware http://bit.ly/Ckqh