A Comparison of Common Users across Instagram and Ask.fm to Better   Understand Cyberbullying
  This paper examines users who are common to two popular online social networks, Instagram and Ask.fm, that are often used for cyberbullying. An analysis of the negativity and positivity of word usage in posts by common users of these two social networks is performed. These results are normalized in comparison to a sample of typical users in both networks. We also examine the posting activity of common user profiles and consider its correlation with negativity. Within the Ask.fm social network, which allows anonymous posts, the relationship between anonymity and negativity is further explored. 
Homa Hosseinmardi, Rahat Ibn Rafiq, Shaosong Li, Zhili Yang, Richard   Han, Shivakant Mishra and Qin Lv
cs.SI cs.CY