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This paper examines the relationships between Internet message-board activity and abnormal stock returns and between Internet message-board activity and abnormal trading volume. This study focuses on RagingBull.com and Internet service sector stocks. I choose RagingBull.com because its format enables me to measure investor opinion objectively. I find that on days with abnormally high message activity changes in investor opinion correlate with abnormal industry-adjusted returns. Additionally, days with abnormally high message activity coincide with abnormally high trading volume both that day and the following day. However, I find that, in general, message-board activity does not predict industry-adjusted returns or abnormal trading volume.

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