Compare the stock returns over 1, 2, 3, and 7 days after being mentioned in the tweet. Highlight any significant patterns or trends.
STOCK: American Express 1_DAY_RETURN: 0.0 2_DAY_RETURN: 0.0039270969690867 3_DAY_RETURN: -0.0018125062934246 7_DAY_RETURN: -0.0057396032625114
The stock shows a consistent negative return trend over the specified periods.