Hi,
We are starting a project on Twitter data sentiment analysis. We have installed LucidWorks, which also has a Solr admin page. By reading the posts, it seems that sentiment analysis can be done by using OpenNLP or machine learning (Mahout or Weka). Can you share with us which tool is good at classifying positive/negative tweets? Also how to use it together with Solr (we only found one posted by Grant on March 16 2010 about integrating Solr with Mahout). Your reply will be appreciated. Thanks.