Just like as Google Alerts, you can get twitter alerts when someone talked about you or about your companies on twtter.com. But, you have to enter the keywords of your name or companies or whatever you wants track, simply use the keywords. When you signuped on tweetbeep you can select options about the tracking result. If can be daily basis or hour basis and you can select specific users too.
So get your tracking results on your email box and know what about people thinking of your companies?