We have covered many extensions for Google Chrome which allows you to customize Google+. You can also add Twitter and Facebook stream into Google+. G+Twitter is a new extension for Chrome which allows you to manage your Twitter account from Google+. It can be said as a real time Twitter client for Google+ which shows your Twitter stream right inside your Google+ with auto refresh feature. You can also easily reply to a tweet or retweet any tweets from your followers.
Once installed, you need to authorize the extension to use your Twitter account. You can also add any hashtags to your stream, so that you can monitor them easily from Google+. There is also option to reply or retweet any tweet in your timeline.
If you want to use Twitter and Google+ together this is probably an useful extension.