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Additional Information

Competing Interests

The authors declare that they have no competing interests.

Author Contributions

Josh Terrell conceived and designed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, performed the computation work, reviewed drafts of the paper.

Andrew Kofink conceived and designed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, performed the computation work, reviewed drafts of the paper.

Justin Middleton conceived and designed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, reviewed drafts of the paper.

Clarissa Rainear analyzed the data, wrote the paper, reviewed drafts of the paper.

Emerson Murphy-Hill conceived and designed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, performed the computation work, reviewed drafts of the paper.

Chris Parnin conceived and designed the experiments, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Jon Stallings conceived and designed the experiments, analyzed the data, wrote the paper, reviewed drafts of the paper.

Ethics

The following information was supplied relating to ethical approvals (i.e., approving body and any reference numbers):

NCSU IRB approved under #6708.

Data Deposition

The following information was supplied regarding data availability:

Data sets from GHTorrent and Google+ are publicly available.

Funding

This material is based in part upon work supported by the National Science Foundation under grant number 1252995. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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