During user interviews, a wide range of general reactions were uncovered. Some users found that the nudges made them reevaluate their large friends lists or caused them to retract unimportant/trivial posts. Other users ignored the nudges or were actively annoyed by them (especially the sentiment nudge). Some users prompted with the profile picture nudge changed their visibility settings or cancelled posts after the nudge. The timer nudge generally caused users to post less frequently, and most users enjoyed the extra window to fix typos or change general sentiment. The sentiment nudge caused some users to post less, but other users specifically increased posts with negative sentiment to "fight back" against Facebook. In general, users receiving the sentiment nudge perceived the nudge to be negative, while the picture and timer nudge participants generally perceived the nudge to be useful.

"Privacy Nudges for Social Media: An Exploratory Facebook Study" Results

51 users were recruited and made to install the browser plugin. During the first stage of the study, activity data was collected without the addition of the nudges. Then, for the second half of the study, users were presented with one of the aforementioned nudges, and their activity data was again collected. Users were also given a final survey to measure their own sentiment towards the nudges.

University of Michigan - Ann Arbor

A Chrome browser plugin was used to present users with the following types of nudges:
- Picture Nudge: Profile pictures of those who may see a post are shown to the user before they make a post, accompanied by text describing who may see the post.
- Timer Nudge: Users are given the option to edit or cancel a post for 10 seconds before it is published. This addresses the fact that regrettable behavior is often done "in the heat of the moment".
- Sentiment Nudge: When potentially regrettable content is found in a post, users are given the aforementioned ten second countdown accompanied by the message "Other users may perceive your post as negative"

"Privacy Nudges for Social Media: An Exploratory Facebook Study" Types of Nudges

https://www.heinz.cmu.edu/~acquisti/papers/Acquisti_Privacy_Nudges_for_Social_Media.pdf

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