Table 2. Factor loadings from EFA of the 27-item MEUS.^a .

Items	Factor 1(withdrawal and health problem)	Factor 2(social comfort)	Factor 3(time management and performance)	Correcteditem–total correlation
23. How often do you sleep less than four hours a day becauseof using microblogs?	0.842	0.082	0.038	0.626**
21. How is your health affected by using microblogs?	0.821	0.025	−0.057	0.690**
20. How often do you feel depressed, moody, or nervous whenyou are off microblogs?	0.789	0.112	0.015	0.696**
22. How often do you continue to use microblogs, even thoughthis use has resulted in continuous or recurrent physical, social, or psychological problems?	0.781	0.105	0.101	0.637**
19. How often do you choose to spend more time on microblogsover going out with others?	0.748	0.145	−0.050	0.672**
13. How often do you snap, yell, or act annoyed if someonebothers you while you are using microblogs?	0.691	0.008	−0.074	0.686**
3. How often do you prefer the excitement of microblogs tointimacy with your partner?	0.682	−0.139	−0.133	0.430**
17. How often do you try to cut down the amount of timeyou spend on microblogs but fail to do so?	0.578	0.027	−0.340	0.726**
15. How often do you feel preoccupied with microblogs when off-line,or fantasize about being on a microblog?	0.566	−0.048	−0.209	0.654**
18. How often do you try to hide how long you have been using microblogs?	0.538	0.177	−0.036	0.651**
5. How often do others in your life complain to you about the amountof time you spend on microblogs?	0.526	0.040	−0.331	0.546**
12. How often do you feel life is empty and boring whenyou are unable to use microblogs?	0.393	0.216	−0.298	0.733**
25. How often do you feel excited when others Retweet your Tweetsor comment on your microblogs?	−0.255	0.744	−0.251	0.564**
24. How often do you change your mood because of a change in thenumber of fans?	0.143	0.654	−0.106	0.632**
27. How often do you get more followers by increasing the number that you are following?	0.330	0.642	0.130	0.579**
26. How often would you try to increase your followersunconsciously by all means?	0.488	0.541	0.137	0.581**
11. How often do you find yourself anticipating when you will usemicroblogs again?	0.051	0.535	0.094	0.589**
1. How often do you find yourself spending more time on microblogsthan you anticipating?	−0.234	0.048	−0.774	0.512**
2. How often do you neglect household chores to spend moretime on microblogs?	0.243	−0.010	−0.667	0.542**
8. How often does your job performance or productivity sufferbecause of your use of microblogs?	0.236	0.114	−0.608	0.430**
7. How often do you check your microblog before something else that you need to do?	0.077	0.287	−0.578	0.627**
16. How often do you find yourself saying “just a few more minutes”when using microblogs?	0.234	0.025	−0.552	0.643**
14. How often do you lose sleep due to late-night log-ins?	0.268	−0.085	−0.527	0.621**
6. How often do your grades or schoolwork suffer because of theamount of time you spend on microblogs?	0.496	−0.055	−0.510	0.674**
4. How often do you make new friends by microblogs?	0.049	0.317	−0.427	0.461**
9. How often do you feel the need to guard against or confidentialwhen someone asks what you do in microblogs?	0.299	0.033	−0.034	0.468**
10. How often do you feel microblogs can help you to comfort andresist the cares of life?	0.053	0.366	−0.080	0.500**
Percentage of variance explained	42.69%	7.35%	5.62%

^aItem numbers correspond to the original item number on the MEUS. **P<.01. The same as below.