1. Tiver E. 2015. This Is Why Instagram Is Winning Over Flickr https://www.investopedia.com/articles/markets/082015/why-instagram-winning-over-flickr.asp. {Online Accessed 17-May-2016} Tiver E. 2015. This Is Why Instagram Is Winning Over Flickr https://www.investopedia.com/articles/markets/082015/why-instagram-winning-over-flickr.asp. {Online Accessed 17-May-2016}
2. Cattuto C. Baldassarri. A. Servedio V. D. P. and Loreto V. 2007. Vocabulary Growth in Collaborative Tagging Systems. arXiv Preprint. Cattuto C. Baldassarri. A. Servedio V. D. P. and Loreto V. 2007. Vocabulary Growth in Collaborative Tagging Systems. arXiv Preprint.
3. Semiotic dynamics and collaborative tagging
4. An epistemic dynamic model for tagging systems
5. Online popularity and topical interests through the lens of instagram