K. Bontcheva, L. Derczynski, A. Funk, M. A. Greenwood, D. Maynard et al., TwitIE: An Open-Source Information Extraction Pipeline for Microblog Text, In RANLP, pp.83-90, 2013.

A. Ritter, S. Clark, and O. Etzioni, Named entity recognition in tweets: an experimental study, Proceedings of the Conference on Empirical Methods in Natural Language Processing, 2011.

K. Nebhi, Ontology-based information extraction from twitter, 2012.

I. S. Iwanaga, T. M. Nguyen, T. Kawamura, H. Nakagawa, Y. Tahara et al., Building an earthquake evacuation ontology from twitter, 2011 IEEE International Conference on Granular Computing, pp.306-311, 2011.
DOI : 10.1109/GRC.2011.6122613

S. Narayan, S. Prodanovic, M. F. Elahi, and Z. Bogart, Population and Enrichment of Event Ontology using Twitter, Information Management SPIM, 2010.

E. Kontopoulos, C. Berberidis, T. Dergiades, and N. Bassiliades, Ontology-based sentiment analysis of twitter posts. Expert systems with applications, pp.4065-4074, 2013.
DOI : 10.1016/j.eswa.2013.01.001

Z. Cheng, J. Caverlee, and K. Lee, You are where you tweet, Proceedings of the 19th ACM international conference on Information and knowledge management, CIKM '10, pp.759-768, 2010.
DOI : 10.1145/1871437.1871535

S. Chandra, L. Khan, and F. B. Muhaya, Estimating Twitter User Location Using Social Interactions--A Content Based Approach, 2011 IEEE Third Int'l Conference on Privacy, Security, Risk and Trust and 2011 IEEE Third Int'l Conference on Social Computing, pp.838-843, 2011.
DOI : 10.1109/PASSAT/SocialCom.2011.120

C. Fink, C. D. Piatko, J. Mayfield, T. Finin, and J. Martineau, Geolocating Blogs from Their Textual Content, AAAI Spring Symposium: Social Semantic Web: Where Web 2.0 Meets Web 3, pp.25-26, 2009.

F. Abel, I. Celik, G. J. Houben, and P. Siehndel, Leveraging the Semantics of Tweets for Adaptive Faceted Search on Twitter, The Semantic Web?ISWC 2011, pp.1-17, 2011.
DOI : 10.1007/11926078_40

Z. Wang, P. Cui, L. Xie, H. Chen, W. Zhu et al., Analyzing social media via event facets, Proceedings of the 20th ACM international conference on Multimedia, MM '12, 2012.
DOI : 10.1145/2393347.2396484

T. Sakaki, M. Okazaki, and Y. Matsuo, Earthquake shakes Twitter users, Proceedings of the 19th international conference on World wide web, WWW '10, 2010.
DOI : 10.1145/1772690.1772777

T. Quack, B. Leibe, and L. Van-gool, World-scale mining of objects and events from community photo collections, Proceedings of the 2008 international conference on Content-based image and video retrieval, CIVR '08, 2008.
DOI : 10.1145/1386352.1386363
URL : http://www.vision.ee.ethz.ch/~tquack/quack_civr08.pdf

K. Watanabe, M. Ochi, M. Okabe, and R. Onai, Jasmine, Proceedings of the 20th ACM international conference on Information and knowledge management, CIKM '11, pp.2541-2544, 2011.
DOI : 10.1145/2063576.2064014

R. Lee and K. Sumiya, Measuring geographical regularities of crowd behaviors for Twitter-based geo-social event detection, Proceedings of the 2nd ACM SIGSPATIAL International Workshop on Location Based Social Networks, LBSN '10, pp.1-10, 2010.
DOI : 10.1145/1867699.1867701

Q. Zhao, P. Mitra, and B. Chen, Temporal and information flow based event detection from social text streams, In AAAI, vol.7, pp.1501-1506, 2007.

H. Li, R. K. Srihari, C. Niu, and W. Li, Location normalization for information extraction, Proceedings of the 19th international conference on Computational linguistics -, pp.1-7, 2002.
DOI : 10.3115/1072228.1072355
URL : http://acl.ldc.upenn.edu/C/C02/C02-1127.pdf

Y. Huang, Z. Liu, and P. Nguyen, Location-based event search in social texts, 2015 International Conference on Computing, Networking and Communications (ICNC), pp.668-672, 2015.
DOI : 10.1109/ICCNC.2015.7069425

C. Li, J. Weng, Q. He, Y. Yao, A. Datta et al., TwiNER, Proceedings of the 35th international ACM SIGIR conference on Research and development in information retrieval, SIGIR '12, pp.721-730, 2012.
DOI : 10.1145/2348283.2348380

Q. H. Ngo, S. Doan, and W. Winiwarter, Using Wikipedia for extracting hierarchy and building geo???ontology, International Journal of Web Information Systems, vol.8, issue.4, pp.401-412, 2012.
DOI : 10.1145/1367497.1367583

D. C. Wimalasuriya and D. Dou, Ontology-based information extraction: An introduction and a survey of current approaches, Journal of Information Science, vol.2, issue.1, 2010.
DOI : 10.1007/BF01840446

M. Nagarajan, H. Purohit, and A. P. Sheth, A Qualitative Examination of Topical Tweet and Retweet Practices, ICWSM, pp.295-298, 2010.

E. Benson, A. Haghighi, and R. Barzilay, Event discovery in social media feeds, The 49th Annual Meeting of the Association for Computational Linguistics: Human Language Technologies-Volume, pp.389-398, 2011.

J. R. Hobbs and F. Pan, An ontology of time for the semantic web, ACM Transactions on Asian Language Information Processing, vol.3, issue.1, pp.66-85, 2004.
DOI : 10.1145/1017068.1017073

V. Krishnan and C. D. Manning, An effective two-stage model for exploiting non-local dependencies in named entity recognition, Proceedings of the 21st International Conference on Computational Linguistics and the 44th annual meeting of the ACL , ACL '06, pp.1121-1128, 2006.
DOI : 10.3115/1220175.1220316
URL : http://acl.ldc.upenn.edu/P/P06/P06-1141.pdf

B. Lee and B. Y. Hwang, A Study of the Correlation between the Spatial Attributes on Twitter, 2012 IEEE 28th International Conference on Data Engineering Workshops, pp.337-340, 2012.
DOI : 10.1109/ICDEW.2012.36

X. Liu, S. Zhang, F. Wei, and M. Zhou, Recognizing named entities in tweets, Proceedings of the 49th Annual Meeting of the Association for Computational Linguistics: Human Language Technologies, pp.359-367, 2011.

E. Sanjuan, V. Moriceau, X. Tannier, P. Bellot, and J. Mothe, Overview of the INEX 2012 tweet contextualization track, Initiative for XML Retrieval INEX, p.148, 2012.

L. Goeuriot, J. Mothe, P. Mulhem, F. Murtagh, and E. Sanjuan, Overview of the CLEF 2016 Cultural Microblog Contextualization Workshop, Experimental IR Meets Multilinguality, Multimodality, and Interaction, Proceedings of the Seventh International Conference of the CLEF Association Lecture Notes in Computer Science (LNCS) 9822, p.2016, 2016.

L. Ermakova and J. Mothe, IRIT at INEX 2012: Tweet Contextualization, CLEF (Online Working Notes, 2012.