One of the classic papers on sentiment analysis utilizes this operator (in 2002, it was AltaVista's NEAR) in the algorithm. "Thumbs Up or Thumbs Down? Semantic

One of the classic papers on sentiment analysis utilizes this operator (in 2002, it was AltaVista's NEAR) in the algorithm. "Thumbs Up or Thumbs Down? Semantic Orientation Applied to Unsupervised Classification of Reviews" by Peter Turney is the paper if anyone is curious.