Research Area
Year Published

654 Results

June 22, 2012

Four Degrees of Separation

ACM Web Science Conference (WebSci)

Frigyes Karinthy, in his 1929 short story “Lancszemek” (in English, “Chains”) suggested that any two persons are distanced by at most six friendship links. Stanley Milgram in his famous experiments challenged people to route postcards to a fixed recipient by passing them only through direct acquaintances. Milgram found that the average number of intermediaries on the path of the postcards lay between 4.4 and 5.7, depending on the sample of people chosen.

By: Lars Backstrom, Paolo Boldi, Marco Rosa, Johan Ugander, Sebastiano Vigna

June 17, 2012

Storage Infrastructure Behind Facebook Messages: Using HBase at Scale

IEEE International Conference on Data Engineering (ICDE)

Facebook Messages, which combines messages, chat and email into a real-time conversation, is the first application in Facebook to use HBase in production.

By: Amitanand Aiyer, Mikhail Bautin, Guoqiang Jerry Chen, Pritam Damania, Prakash Khemani, Kannan Muthukkaruppan, Karthik Ranganathan, Nicolas Spiegelberg, Liyin Tang, Madhuwanti Vaidya

June 8, 2012

Social Influence in Social Advertising: Evidence from Field Experiments

ACM Conference on Electronic Commerce (EC)

Social advertising uses information about consumers’ peers, including peer affiliations with a brand, product, organization, etc., to target ads and contextualize their display. This approach can incr…

By: Eytan Bakshy, Dean Eckles, Rong Yan, Itamar Rosenn

June 1, 2012

Power and Performance Evaluation of Memcached on the TILEPro64 Architecture

Sustainable Computing: Informatics and Systems

Power consumption of data centers had become an important factor in the economy and sustainability of large-scale Web services. Researchers and practitioners are spending considerable effort to characterize Web-scale workloads and evaluating their applicability to alternative, more power-efficient architectures. One such workload in particular is the caching layer, which stores expensive-to-regenerate data in fast storage to reduce service times.

By: Mateusz Berezecki, Eitan Frachtenberg, Michael Paleczny, Ken Steele

May 16, 2012

The spread of emotion via Facebook

ACM Conference on Human Factors in Computing Systems (CHI)

In this paper we study large-scale emotional contagion through an examination of Facebook status updates. After a user makes a status update with emotional content, their friends are significantly more likely to make a valence-consistent post.

By: Adam D. I. Kramer

May 1, 2012

Thermal Design in the Open Compute Datacenter

IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITHERM)

The advent of Web-based services and cloud computing has instigated an explosive growth in demand for datacenters. Traditionally, Internet companies would lease datacenter space and servers from vendors that often emphasize flexibility over efficiency. But as these companies grew larger, they sought to reduce acquisition and operation costs by building their own datacenters.

By: Eitan Frachtenberg, Dan Lee, Marco Magarelli, Veerendra Mulay, Jay Park

April 25, 2012

PACMan: Coordinated Memory Caching for Parallel Jobs

USENIX Symposium on Networked Systems Design and Implementation (NSDI)

Data-intensive analytics on large clusters is important for modern Internet services. As machines in these clusters have large memories, in-memory caching of inputs is an effective way to speed up the…

By: Ganesh Ananthanarayanan, Ali Ghodsi, Andrew Wang, Dhruba Borthakur, Srikanth Kandula, Scott Shenker, Ion Stoica

April 17, 2012

Structural Diversity in Social Contagion

Proceedings of the National Academy of Sciences (PNAS)

The concept of contagion has steadily expanded from its original grounding in epidemic disease to describe a vast array of processes that spread across networks, notably social phenomena such as fads,…

By: Johan Ugander, Lars Backstrom, Cameron Marlow, Jon Kleinberg

April 16, 2012

The Role of Social Networks in Information Diffusion

International World Wide Web Conference (WWW)

Online social networking technologies enable individuals to simultaneously share information with any number of peers. Quantifying the causal effect of these mediums on the dissemination of informatio…

By: Eytan Bakshy, Itamar Rosenn, Cameron Marlow, Lada Adamic

March 1, 2012

Bootstrapping Data Arrays of Arbitrary Order

The Annals of Applied Statistics (AOAS)

In this paper we study a bootstrap strategy for estimating the variance of a mean taken over large multifactor crossed random effects data sets. We apply bootstrap reweighting independently to the lev…

By: Art B. Owen, Dean Eckles