PUBLICATIONS

2020:

1) Still out there: Modeling and Identifying Russian Troll Accounts on Twitter​
Jane Im, Eshwar Chandrasekharan, Jackson Sargent, Paige Lighthammer, Taylor Denby, Ankit Bhargava, Libby Hemphill, David Jurgens, Eric Gilbert | WebSci 2020 |Paper

• There is evidence that Russia's Internet Research Agency attempted to interfere with the 2016 U.S. election by running fake accounts on Twitter—often referred to as "Russian trolls". In this work, we: 1) develop machine learning models that predict whether a Twitter account is a Russian troll within a set of 170K control accounts; and, 2) demonstrate that it is possible to use this model to find active accounts on Twitter still likely acting on behalf of the Russian state. Using both behavioral and linguistic features, we show that it is possible to distinguish between a troll and a non-troll with a precision of 78.5% and an AUC of 98.9%, under cross-validation. Applying the model to out-of-sample accounts still active today, we find that up to 2.6% of top journalists' mentions are occupied by Russian trolls. These findings imply that the Russian trolls are very likely still active today. 

​2) Synthesized Social Signals: Computationally-Derived Social Signals from Account Histories
Jane Im, Sonali Tandon, Eshwar Chandrasekharan, Taylor Denby, Eric Gilbert | CHI 2020 | Paper

• In this paper, we propose a new idea called synthesized social signals (S3s): social signals computationally derived from an account's history, and then rendered into the profile. To demonstrate and explore the concept, we built Sig, an extensible Chrome extension that computes and visualizes S3s. Results from field deployments show that Sig reduced receiver costs, added important signals beyond conventionally available ones, and that a few users felt safer using Twitter as a result.

Doctoral Thesis:

Combatting Abusive Behavior in Online Communities Using Cross-Community Learning | Georgia Tech |  Thesis

• Defended PhD thesis on March 3, 2020. Graduated with a PhD in CS from Georgia Tech on May 1, 2020.

2019:

1) Crossmod: A Cross-Community Learning-based System to Assist Reddit Moderators
Eshwar Chandrasekharan, Chaitrali Gandhi, Matthew Wortley Mustelier, Eric Gilbert | CSCW 2019 | Paper

• In this paper, we introduce a novel sociotechnical moderation system for Reddit called Crossmod. Through formative interviews with 11 active moderators from 10 different subreddits, we learned about the limitations of currently available automated tools, and build a new system that extends their capabilities. To the best of our knowledge, Crossmod is the first open source, AI-backed sociotechnical moderation system to be designed using participatory methods.​

2) A Just and Comprehensive Strategy for Using NLP to Address Online Abuse
David Jurgens, Eshwar Chandrasekharan, Libby Hemphill | ACL 2019 | Paper

• Online abusive behavior affects millions and the NLP community has attempted to mitigate this problem by developing technologies to detect abuse. However, current methods have largely focused on a narrow definition of abuse to detriment of victims who seek both validation and solutions. In this position paper, we argue that the community needs to make three substantive changes: (1) expanding our scope of problems to tackle both more subtle and more serious forms of abuse, (2) developing proactive technologies that counter or inhibit abuse before it harms, and (3) reframing our effort within a framework of justice to promote healthy communities.

3) Prevalence and Psychological Effects of Hateful Speech in Online College Communities
Koustuv Saha, Eshwar Chandrasekharan, Munmun De Choudhury | WebSci 2019 | Paper

• We employ a causal-inference framework to study the psychological effects of hateful speech in these college subreddits, particularly in the form of individuals’ online stress expression. Our findings suggest that exposure to hate leads to greater stress expression. However, everybody exposed is not equally affected; some show lower psychological endurance to hate than others. Low endurance individuals are more vulnerable to emotional outbursts, and are more neurotic than those with higher endurance.

4) Hybrid Approaches to Detect Comments Violating Macro Norms on Reddit
Eshwar Chandrasekharan, Eric Gilbert |  (under submission) | Paper on arXiv | Dataset

• ​In this dataset paper, we present a three-stage process to collect Reddit comments that are removed comments by moderators of several subreddits, for violating subreddit rules and guidelines. Working with over 2.8M removed comments collected from 100 different communities on Reddit, we identify 8 macro norms (i.e., norms that are widely enforced on most parts of Reddit). We extract these macro norms by employing a hybrid approach (classification, topic modeling, and open-coding), on comments identified to be norm violations within at least 85 out of the 100 study subreddits. Finally, we label over 40K Reddit comments removed by moderators according to the specific type of macro norm being violated, and make this dataset publicly available.

2018:

1) The Internet’s Hidden Rules: An Empirical Study of Reddit Norm Violations at Micro, Meso, and Macro Scales
Eshwar Chandrasekharan, Mattia Samory, Shagun Jhaver, Hunter Charvat, Amy Bruckman, Cliff Lampe, Jacob Eisenstein, Eric Gilbert | CSCW 2018 | Paper 

• In this paper, we study community norms on Reddit in a large-scale, empirical manner. Via 2.8M comments removed by moderators of 100 top subreddits over 10 months, we use both computational and qualitative methods to identify three types of norms: macro norms that are universal to most parts of Reddit; meso norms that are shared across certain groups of subreddits; and micro norms that are specific to individual, relatively unique subreddits. Given the size of Reddit’s user base we argue this represents the first large-scale study of norms across disparate online communities. In other words, these findings shed light on what Reddit values, and how widely-held those values are.​

2017:

1) You Can't Stay Here: The Efficacy of Reddit's 2015 Ban Examined Through Hate Speech
Eshwar Chandrasekharan, Umashanthi Pavalanathan, Anirudh Srinivasan, Adam Glynn, Jacob Eisenstein, Eric Gilbert | CSCW 2017| Paper 

• In 2015, Reddit closed several subreddits​—foremost among them r/fatpeoplehate and r/CoonTown—due to violations of Reddit's anti-harassment policy. However, the effectiveness of banning as a moderation approach remains unclear: banning might diminish hateful behavior, or it may relocate such behavior to different parts of the site. We study the ban of r/fatpeoplehate and r/CoonTown in terms of its effects on both participating users and affected subreddits. Working from over 100M Reddit posts and comments, we generate hate speech lexicons to examine variations in hate speech usage via causal inference methods. We find that the ban worked for Reddit. More accounts than expected discontinued using the site; those that stayed drastically decreased their hate speech usage—atleast by 80%. Though many subreddits saw an influx of r/fatpeoplehate and r/CoonTown "migrants", those subreddits saw no significant change in hate speech usage. In other words, other subreddits did not inherit the problem.

2) The Bag of Communities: Identifying Abusive Behavior Online with Preexisting Internet Data​ 
​ Eshwar Chandrasekharan, Mattia Samory, Anirudh Srinivasan, Eric Gilbert | CHI 2017 | Paper 

• We introduce a novel computational approach to address this problem called Bag of Communities (BoC)—a technique that leverages large-scale, preexisting data from other Internet communities. Using this conceptual and empirical work, we argue that the BoC approach may allow communities to deal with a range of common problems, like abusive behavior, faster and with fewer engineering resources.

3) Situated Anonymity: Impacts of Anonymity, Ephemerality, and Hyper-Locality on Social Media
 Ari Schlesinger, Eshwar Chandrasekharan, Christina Masden, Amy Bruckman, W Keith Edwards, Rebecca Grinter | CHI 2017 | Paper 

• We conducted an interview-based study to examine the factors that were integral to the success and popularity of Yik Yak during its initial deployment, by interviewing 18 Yik Yak users on an urban university campus.

2015:

1) Footprints on Silicon:  Explorations in Gathering Autobiographical Content
​ Eshwar Chandrasekharan, Sutanu Chakraborti | CICLing (IJCLA) 2015 | Paper 

• We built a system that can identify emails containing autobiographical content for aiding the autobiographical summarization of a user’s mail Inbox, over the years. This data can be used to generate a story about the user’s life or an autobiography of sorts.