트윗싹둑! is a Chrome extension that makes it easier to write tweets on Twitter by automatically cutting text into 140 characters, including mention marks and hashtags.

With 트윗싹둑!, you no longer have to manually split your lengthy tweets into multiple 140-character segments. The extension automatically divides your text into tweet-sized chunks.

When a tweet segment is cut, you can simply click on it to automatically copy it to your clipboard. You can then manually compose your tweets on the official Twitter website or third-party clients like TweetDeck.

Additionally, 트윗싹둑! can automatically include the usernames of the Twitter accounts you want to mention in each tweet segment.

For more detailed instructions on how to use the program, simply click on the HELP button within the extension.

Please note that due to Chrome's policy, there is no way to always keep the extension's popup visible. However, you can assign a shortcut key to activate the 트윗싹둑! extension by clicking on "Shortcuts" at the bottom right of the Chrome Extensions management page (enter chrome://extensions/ in the address bar).

Please note that 트윗싹둑! currently only supports the Korean language.