This study examined the organizational impression management (OIM) strategies adopted by the US law firms on Twitter. The Diction software package for textual analysis of nearly 10,000 tweets, coupled with statistical analysis, was used to assess the significant differences among law firms over 5 years. Although higher revenue law firms were found to exhibit higher certainty and optimism than lower revenue firms, analysis via repeated measures analysis of variance did not show significant differences. When companies’ OIM strategies were observed over a period of 5 years, there was a statistically significant difference in activity between 2011 and 2014. The findings add to the body of corporate communications research through examination of social media OIM strategies used by financially successful US law firms.