Abstract
The text of the opening columns of two national newspapers and one weekly magazine were selected for analysis, and changes in characteristics such as the total number of characters, punctuation rate, parentheses rate, and katakana rate were examined in these columns in the SNS era.
The results showed that Newspaper B showed a significant increase in the percentage of punc-tuation in sentences after the 2000s. The percentage of parentheses in Newspaper A increased significantly from the 1980s to the 2010s.