Named Entity Recognition in Tweets: An Experimental Study Alan Ritter author Sam Clark author Mausam author Oren Etzioni author 2011-07 text Proceedings of the 2011 Conference on Empirical Methods in Natural Language Processing Regina Barzilay editor Mark Johnson editor Association for Computational Linguistics Edinburgh, Scotland, UK. conference publication ritter-etal-2011-named https://aclanthology.org/D11-1141/ 2011-07 1524 1534