This document lists the scales used in the survey reported in: Utz, S. & Beukeboom, C. J. (2011). The role of sites in romantic relationships: Effects on jealousy and relationship happiness. Journal of Computer- Mediated Communication, 16 (4), 511-527. DOI:10.1111/j.1083-6101.2011.01552.x Link to article: http://hdl.handle.net/1871/32712

Please refer to the article for more information on the method. Prof. Dr. Sonja Utz Dr. Camiel J. Beukeboom

SNS Use  Login On which social network sites do you have a profile? o Hyves o o MySpace o o Xing o LinkedIn o sugababes/superdudes o Different, namely…. Which of these sites do you use regularly? o none o Hyves o Facebook o MySpace o Orkut o Xing o LinkedIn o Sugababes/superdudes o Different, namely…

On which social network site are you most active? login How often do you login on your favourite SNS? (1 several times a day; 2 (almost) daily; 3 several times a week; 4 several times a month 5; less than once a month )

SNS Use for profile maintenance and grooming.  Profile maintenance 1. How often do you change your profile? 2. How often do you upload pictures? 3. How often do you invite friends to use gadgets or applications? 4. How often do you change your wiewatwaar/what's on your mind? 5. How often do you blog?  Grooming 1. How often do you visit the profiles of close friends? 2. How often do you visit the profiles of acquaintances? 3. How often do you leave messages (krabbels, wallposts) on the profiles of close friends? 4. How often do you leave messages (krabbels, wallposts) on the profiles of acquaintances? 5. How often do you read the buzz/mini-feeds (what your friends are doing)? 6. How often do you browse around, check profiles of people not in your network? 7 point Likert scale (1=Never – 7=Daily)

Note: Gadgets was a feature available on Hyves, a popular Dutch SNS at the time of the study. “Wiewatwaar” (Whowhatwhere) corresponds roughly to a status update. "krabbel" refers to the (no-longer existing) Dutch SNS Hyves (similar to a wall-post).

SNS monitoring behavior Four items from the Facebook Jealousy scale (excluding 1 item) by Muise, A., Christofides, E., & Desmarais, S. (2009). More information than you ever wanted: Does Facebook bring out the green-eyed monster of jealousy? CyberPsychology & Behavior, 12, 441–444. 1. Monitor your partner’s activities on the SNS. 2. Look at your partner’s profile page if you are suspicious of his or her activities. 3. Check your partner’s profile on a regular basis. 4. Add your partner’s friends as friends to keep tabs on your partner. 7 point Likert scale (1=very unlikely, 2=unlikely, 3=somewhat unlikely, 4=neither likely no unlikely, 5=somewhat likely, 6=likely, 7=very likely)

SNS relationship happiness. How likely are you to… 1. Become happy after looking at your partners profile. 2. Become happy if your partner posted an accurate relationship status. 3. Become happy if your partner posted a krabbel/a message to your wall referring to your relationship. 4. Become happy if your partner posts a picture of you. 5. Become happy if your partner post pictures of him or herself with an arm around you. 7 point Likert scale (1=very unlikely, 2=unlikely, 3=somewhat unlikely, 4=neither likely no unlikely, 5=somewhat likely, 6=likely, 7=very likely)

Note: "krabbel" refers to the (no-longer existing) Dutch SNS Hyves (similar to a wall-post).

Monitoring behavior. Based on Pfeiffer, S. M. & Wong, T. P. (1989). Multidimensional Jealousy. Journal of Social and Personal Relationships, 6, 181-196. + self developed questions

1. How often do you look through your partner's drawers, handbag, or pockets? 2. How often do you secretly read the SMS messages on your partner's mobile phone? 3. How often do you secretly read your partner's emails? 7 point Likert scale (1=Never – 7=All the time)