Table 2. Comparing communities in social activities and language use, where measures on language use count the percentages of words that reflect different psychometric properties, such as concerns, emotions and thinking styles, in a user’s historical tweets.
Two-sided Mann-Whitney U tests evaluate differences between groups, significance levels with Bonferroni correction: * p < 0.05/m; ** p < 0.01/m; *** p < 0.001/m where m = 22.
| Measure | Description | Pro-ED (μ ± σ) | Pro-Rec.(μ ± σ) | z | p |
|---|---|---|---|---|---|
| Social Activities | |||||
| #Followees | Number of total followees | 543.70 ± 1,096.09 | 1,561.58 ± 4,022.53 | -14.82 | 0.000 *** |
| #Tweets | Number of total tweets | 2,573.03 ± 6,515.83 | 5,485.02 ± 10,166.14 | -9.24 | 0.000 *** |
| #Followers | Number of total followers | 1,339.11 ± 27,384.37 | 16,299.21 ± 128,844.20 | -17.52 | 0.000 *** |
| #Followees/day | Average number of followees per day | 2.22 ± 7.23 | 1.72 ± 6.18 | 3.36 | 0.001 * |
| #Tweets/day | Average number of tweets per day | 5.48 ± 9.01 | 4.13 ± 8.73 | 7.69 | 0.000 *** |
| #Followers/day | Average number of followers per day | 2.41 ± 12.36 | 7.51 ± 46.21 | -3.81 | 0.000 ** |
| %Re-tweet | Ratio of re-tweets in historical posts | 0.30 ± 0.20 | 0.21 ± 0.18 | 9.76 | 0.000 *** |
| %Mention | Ratio of posts with mentions | 0.31 ± 0.17 | 0.36 ± 0.20 | -5.08 | 0.000 *** |
| %Reply | Ratio of posts with replies | 0.10 ± 0.09 | 0.15 ± 0.13 | -7.10 | 0.000 *** |
| H(Re-tweet) | Entropy of re-tweeting others | 4.28 ± 1.20 | 3.36 ± 1.08 | 16.97 | 0.000 *** |
| H(Mention) | Entropy of mentioning others | 2.33 ± 1.09 | 2.91 ± 1.04 | -11.76 | 0.000 *** |
| H(Reply) | Entropy of replying others | 2.71 ± 1.21 | 2.87 ± 1.05 | -3.09 | 0.002 * |
| Language Use | |||||
| Body | Concerns of body image | 0.02 ± 0.01 | 0.01 ± 0.01 | 25.68 | 0.000 *** |
| Ingest | Concerns of ingestion | 0.03 ± 0.02 | 0.02 ± 0.02 | 13.41 | 0.000 *** |
| Health | Concerns of health | 0.02 ± 0.01 | 0.02 ± 0.01 | 0.97 | 0.334 |
| I | 1st personal singular use | 0.11 ± 0.03 | 0.04 ± 0.03 | 30.94 | 0.000 *** |
| We | 1st personal plural use | 0.00 ± 0.00 | 0.01 ± 0.01 | -25.52 | 0.000 *** |
| Social | Social concerns | 0.08 ± 0.02 | 0.11 ± 0.03 | -19.78 | 0.000 *** |
| Swear | Abusive language | 0.01 ± 0.01 | 0.00 ± 0.00 | 28.84 | 0.000 *** |
| Negate | Negation use | 0.03 ± 0.01 | 0.02 ± 0.01 | 25.86 | 0.000 *** |
| Posemo | Positive emotions | 0.05 ± 0.01 | 0.06 ± 0.02 | -18.34 | 0.000 *** |
| Negemo | Negative emotions | 0.04 ± 0.01 | 0.02 ± 0.01 | 26.14 | 0.000 *** |