Can you change your username without affecting your followers?

Yes, changing your Twitter username is visible to your followers, but the visibility depends on how closely they follow your account activity:

### What Followers Will See:
1. **Profile Updates**: Your followers will see the updated username (handle) on your profile. If they visit your profile or see it in their feed, they will see the new handle.
   
2. **Mentions and Tags**: Any new mentions or tags will use your updated username. However, previous mentions or tags that used your old username will not automatically update.

3. **Notification of Change**: Twitter does not send a specific notification to your followers that you've changed your username. Therefore, it's a good idea to inform your followers about the change to avoid confusion.

### Potential Visibility Issues:
1. **Confusion**: Some followers might be confused if they're used to your old username and might not immediately recognize your new handle.

2. **Search and Mentions**: If people search for your old username or mention it, they might not find your account or might be confused if they don't realize you've changed your handle.

### Best Practices:
1. **Announce the Change**: Post a tweet or send a message letting your followers know that you've changed your username and provide the new handle. This can help in ensuring that they are aware of the update.
   
2. **Update Your Links**: Make sure to update any links or references to your old username on other social media platforms, websites, or in any professional materials.

3. **Monitor for Confusion**: Keep an eye on your notifications and interactions for any confusion from your followers and address it promptly.

In summary, while the change in your username will be visible to your followers on your profile and in new interactions, it's up to you to manage the transition smoothly and ensure that your followers are aware of the update.