Willingness to Tweet

Last registered on March 21, 2021


Trial Information

General Information

Willingness to Tweet
Initial registration date
March 17, 2021

Initial registration date is when the trial was registered.

It corresponds to when the registration was submitted to the Registry to be reviewed for publication.

First published
March 18, 2021, 6:14 AM EDT

First published corresponds to when the trial was first made public on the Registry after being reviewed.

Last updated
March 21, 2021, 9:26 AM EDT

Last updated is the most recent time when changes to the trial's registration were published.



Primary Investigator

Harvard University

Other Primary Investigator(s)

PI Affiliation
NHH Norwegian School of Economics
PI Affiliation
University of Warwick
PI Affiliation
University of Chicago

Additional Trial Information

In development
Start date
End date
Secondary IDs
We examine how social image considerations affect participants' willingness to publicly Tweet about socially sensitive topics.
External Link(s)

Registration Citation

Bursztyn, Leonardo et al. 2021. "Willingness to Tweet." AEA RCT Registry. March 21. https://doi.org/10.1257/rct.7379-1.2000000000000002
Experimental Details


We vary the perceived social image cost associated with making a Tweet about a socially sensitive topic.
Intervention Start Date
Intervention End Date

Primary Outcomes

Primary Outcomes (end points)
Whether or not the participant chooses to authorize the anti-immigrant Twitter post
Primary Outcomes (explanation)

Secondary Outcomes

Secondary Outcomes (end points)
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
We vary the perceived social pressure associated with making a Tweet about a socially sensitive topic.
Experimental Design Details
Participants are shown a video of Fox News host Tucker Carlson discussing the link between illegal immigration and crime and decide whether or not to (privately) join a campaign to deport all illegal immigrants. They are then told they will have the opportunity to schedule a post to be made on their Twitter account encouraging their followers to sign a petition to immediately deport all illegal immigrants. (They are told that this post will be made public if and when we have reached survey respondents in all US counties. However, given that we are collecting fewer observations than the number of US counties, this will not happen, and thus the anti-immigrant posts will never be made public.)

The experiment manipulates only one word: whether the post indicates that the participant saw the video before joining the campaign, or after joining the campaign. We are interested in examining whether respondents who believe that their audience will believe that they saw the video before joining -- and thus, had an "excuse" to join -- are more willing to schedule the post.
Randomization Method
Randomization through Qualtrics
Randomization Unit
Was the treatment clustered?

Experiment Characteristics

Sample size: planned number of clusters
Sample size: planned number of observations
We will ideally recruit 1000 participants. However, based on conversations with our survey provider, it may be infeasible to recruit 1000; they have guaranteed that we can recruit at least 500. Thus, we will end our collection when we reach 1000 or after five days have elapsed (whichever occurs first). We will restrict our sample to people who pass a simple attention check (pre-intervention).
Sample size (or number of clusters) by treatment arms
250-500 treatment, 250-500 active control (see above)
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
With 500 respondents total, based on our pilot data, we will have 80% power to detect an 11 percentage point effect at the 10% level. With 1000 respondents, we will have 80% power to detect a 8 percentage point effect at the 10% level.

Institutional Review Boards (IRBs)

IRB Name
University of Chicago Social and Behavioral Sciences IRB
IRB Approval Date
IRB Approval Number


Post Trial Information

Study Withdrawal

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Is the intervention completed?
Data Collection Complete
Data Publication

Data Publication

Is public data available?

Program Files

Program Files
Reports, Papers & Other Materials

Relevant Paper(s)

Reports & Other Materials