Compare the stock returns over 1, 2, 3, and 7 days after being mentioned in the tweet. Highlight any significant patterns or trends.
STOCK: Viacom 1_DAY_RETURN: 0.0029368575624082 2_DAY_RETURN: -0.0337738619676945 3_DAY_RETURN: -0.0425844346549191 7_DAY_RETURN: -0.0337738619676945
The stock shows a consistent negative return trend over the specified periods.