Appendix 1:

Names and descriptions of all group members (excluding the participant)

Nr. / User name / Description
1 / Georgeee / “I'm a 19 year old dude from Wisconsin (commence making fun of my accent). I love music and lately you can catch me listening to nothing but Joy Division, Echo & the bunnymen, and the smiths. Besides music I like learning languages, psychology, drawing, and writing.”
2 / Sarah / “Let me introduce myself. I’m Sarah, married, and mother of two wonderful (grown up) children. My career has been a bit peculiar. Starting off as a graduate historian, I switched to an entirely different discipline: occupational assessor trying to help young people with disabilities to get a job. I’ve just retired and started spending more time on my hobbies, such as singing, reading, and playing volleyball.”
3 / John / “Hi there, I’m 57 years old, married, with two kids. I’ve been a computer programmer in the states for about 30 years, but don’t worry: I don’t have the dusty haircut, oversized buttoned shirt and nerdie big frame glasses. Looking forward to working with you all. Cheers, John”
4 / AncaD / “I am a Computer Science student, interested in Natural Language processing. Also a lover of loose leaf tea and a Semantic Web enthusiast. I’m curious about what this task is about.”
5 / Nick / “My life revolves around rock climbing. I started climbing when I was 12 (turning 18 soon) and usually climb 4-5 hours a day. Climbing never bores me, because each time is different – the routes, the weather, my strength and endurance. It’s great!”
6 / Mary / “My name is Mary and I am 49 years old. I have a husband and 2 grown sons. My family and I lived in different countries. Our sons attended international schools wherever we went and since moving to China, I found work at those schools as well. Besides roaming around the world, I like playing games. Board games, cards, black jack or poker, mah jong, or silly games on Facebook, jig saws, basically anything”
7 / Lauren / “I’m Lauren, I love to hang out with friends and go shopping. Just doing some online studies here!”
8 / Arjen / “My name's Arjen, I study Artificial Intelligence. Also I like to use my free time to make all kinds of different things... I'm kind of a nerd too, I guess.”
9 / Heather / “Just now I'm finishing up my first year of a difficult science curriculum in university. I also work at a cosmetics counter as a part-time thing and earn some money online in my free time. I have a lot planned for my future, and it's really exciting. I want to grow up and be a doctor with a family of lots of little dogs. It'll be fantastic.”
10 / Jane / “Dear all, my name is Jane and I will soon have an important interview. This is all I can think about these days. I hope you're doing well”
11 / Ky / “Hey, guys. I'm 19, native Korean. I've been in America for about four years now.I consider myself pretty nice, though not a total angel. I just like being friendly to people I meet. In my spare time, I like making all kinds of friends, having conversations about whatever, looking at paintings, using makeup, reading, singing (show choir representtt!), making jewelry, and eating delicious food. Enjoy your day, stay out of trouble. <3”

Appendix 2:

Distribution of likes in the Ostracism Online study

Number of likes per condition
Member name / Ostracism / Inclusion / Overinclusion
Participant / 1 / 5 / 9
Sarah / 9 / 5 / 1
Lauren / 1 / 1 / 1
John / 2 / 2 / 2
Jane / 2 / 2 / 2
Mary / 3 / 3 / 3
Arjen / 3 / 3 / 3
Georgeee / 4 / 4 / 4
AncaD / 5 / 5 / 5
Heather / 5 / 5 / 5
Nick / 6 / 6 / 6
Ky / 7 / 7 / 7

Appendix 3:

Reflexive Need-threat and Mood Questionnaire

For each question, please circle the number to the right that best represents the feelings you were experiencing DURING the game. /

Not at all

/

Extremely

Belonging
I felt “disconnected” (R) / 1 / 2 / 3 / 4 / 5
I felt rejected (R) / 1 / 2 / 3 / 4 / 5
I felt like an outsider (R) / 1 / 2 / 3 / 4 / 5
I felt I belonged to the group / 1 / 2 / 3 / 4 / 5
I feel the other players would interact with me a lot / 1 / 2 / 3 / 4 / 5
Self esteem
I felt good about myself / 1 / 2 / 3 / 4 / 5
My self-esteem was high / 1 / 2 / 3 / 4 / 5
I felt liked / 1 / 2 / 3 / 4 / 5
I felt insecure (R) / 1 / 2 / 3 / 4 / 5
I felt satisfied / 1 / 2 / 3 / 4 / 5
Meaningful existence
I felt invisible (R) / 1 / 2 / 3 / 4 / 5
I felt meaningless (R) / 1 / 2 / 3 / 4 / 5
I felt non-existent (R) / 1 / 2 / 3 / 4 / 5
I felt important / 1 / 2 / 3 / 4 / 5
I felt useful / 1 / 2 / 3 / 4 / 5
Control
I felt powerful / 1 / 2 / 3 / 4 / 5
I felt I had control over the course of the game / 1 / 2 / 3 / 4 / 5
I felt I had the ability to significantly alter events / 1 / 2 / 3 / 4 / 5
I felt I was unable to influence the action of others (R) / 1 / 2 / 3 / 4 / 5
I felt the other players decided everything (R) / 1 / 2 / 3 / 4 / 5
MOOD
Good / 1 / 2 / 3 / 4 / 5
Bad / 1 / 2 / 3 / 4 / 5
Friendly / 1 / 2 / 3 / 4 / 5
Unfriendly / 1 / 2 / 3 / 4 / 5
Angry / 1 / 2 / 3 / 4 / 5
Pleasant / 1 / 2 / 3 / 4 / 5
Happy / 1 / 2 / 3 / 4 / 5
Sad / 1 / 2 / 3 / 4 / 5

Appendix 4:

Direct and indirect assessment of participants’ level of engagement in the study

Item / Answer options
Did you spent the whole 3 minutes on the "Introduction" task? / Yes, all the time+
Most of the time, but I switched tasks-
No, I was browsing the internet--
No, I was doing something else--
Did you read the other people's personal descriptions? / Yes, all of them+
Yes, most of them+
Some of them-
No, I did not read any descriptions--
Did you pay attention to how many "likes" you received? / Yes+ / No-
Did you pay attention to how many "likes" the others received? / Yes+ / No-
Do you think the other people you worked with were similar to you? / No, not at all similar
Somewhat dissimilar
Somewhat similar
Yes, very similar
How easy was it for you to imagine the others in real life? / Not at all easy
Somewhat easy
Very easy
please leave this question blank (IMC; Oppenheimer et al., 2009) / Leaving blank+
Failing to leave blank--

Appendix 5:

Model and contrasts in ANOVAonewayNonhomogvarJagsSTZ.R .

THE MODEL.

modelstring = "

model {

for ( i in 1:Ntotal ) {

y[i] ~ dnorm( mu[i] , tau[x[i]] )

mu[i] <- a0 + a[x[i]]

}

a0 ~ dnorm(0,0.001)

for ( j in 1:NxLvl ) {

a[j] ~ dnorm( 0.0 , atau )

tau[j] ~ dgamma( sG , rG )

}

sG <- pow(m,2)/pow(d,2)

rG <- m/pow(d,2)

m ~ dgamma(1,1)

d ~ dgamma(1,1)

atau <- 1 / pow( aSD , 2 )

aSD <- abs( aSDunabs ) + .1

aSDunabs ~ dt( 0 , 0.001 , 2 )

# Convert a0,a[] to sum-to-zero b0,b[] :

for ( j in 1:NxLvl ) { mpred[j] <- a0 + a[j] }

b0 <- mean( mpred[1:NxLvl] )

for ( j in 1:NxLvl ) { b[j] <- mpred[j] - b0 }

}

" # close quote for modelstring

# Write model to a file, and send to BUGS:

writeLines(modelstring,con="model.txt")

#------

# THE DATA&CONTRASTS.

# Specify data source:

dataSource = c( "Nonhomogvar" )[1]

# Load the data:

if ( dataSource == "Nonhomogvar" ) {

fileNameRoot = paste( fileNameRoot , dataSource , sep="" )

datarecord = read.csv( "NonhomogVarData.csv" )

y = datarecord$Conformity

Ntotal = length(y)

x = as.numeric(datarecord$Conditionletters)

xnames = levels(datarecord$Conditionletters)

NxLvl = length(levels(datarecord$Conditionletters))

normalize = function( v ){ return( v / sum(v) ) }

contrastList = list(

AvB = (xnames=="A")-(xnames=="B") ,

AvC = (xnames=="A")-(xnames=="C") ,

BvC = (xnames=="B")-(xnames=="C") ,

DvE = (xnames=="D")-(xnames=="E") ,

DvF = (xnames=="D")-(xnames=="F") ,

EvF = (xnames=="E")-(xnames=="F") ,

ABvDE = ((xnames=="A")-(xnames=="B"))-((xnames=="D")-(xnames=="E")),

ACvDF = ((xnames=="A")-(xnames=="C"))-((xnames=="D")-(xnames=="F")),

BCvEF = ((xnames=="B")-(xnames=="C"))-((xnames=="E")-(xnames=="F"))

)

}

Contrast specification:

A = Cyberball Manipulation, Ostracism Condition

B = Cyberball Manipulation, Inclusion Condition

C = Cyberball Manipulation, Overinclusion Condition

D = Ostracism Online Manipulation, Ostracism Condition

E = Ostracism Online Manipulation, Inclusion Condition

F = Ostracism Online Manipulation, Overinclusion Condition