Measurement of your Social Media activity is an important aspect of measuring the amount of attention you are receiving, your influence as a thought leader, your connection. There are a range of tools available to measure many aspects.
This tool is one of the many live tools. In this case it measures your Twitter activity with an uptodate list of those who reply to your tweets.
The following is a recent chart of the Tweet Twins tweets. Click on this link will take you to a live link where you can also measure your tweets. Make sure you scroll down as you will see those who have engaged with the Tweets and event the tweets at the time.