| Sub-index | Meaning |
| Topic concentration (TC) | Frequency of occurrence of irrelevant topics |
| Opinion leader intensity (OLI) | The level of influence of opinion leaders |
| Access difficulty (AD) | The difficulty of absorbing PVC |
| Uniqueness of discourse system (UDS) | The difficulty for non-PVC members to understand the discourse system |
| Freedom of viewpoint expression (FVE) | The extent to which opinions are restricted in the circle group |
| Identity information transparency (IIT) | Degree of filing and disclosure of personal information |
| Offline communication possibility (OCP) | Offline communication probability of PVC users |
| New content release intensity (NCRI) | Compared with similar PVC, 24 hours of new information update speed |
| New content display level (NCDL) | Duration of new content on the home page or recommendation screen |
| Short-term attention level (STAL) | 24 hours of new information reading, likes, comments |
| Internal recommendation strength (IRS) | PVC internal new information top or significantly recommended number |
| Velocity of viewpoint derivation (VVD) | Number of relevant new ideas generated in 24 hours |