I don't understand this new activity thing. Please give a example to tell us the formula for activity.
Here it is:
The activity number is determined in this way:
time = number of two-week periods in which you've posted since your registration
activity = min(time * 14, posts)
Activity is updated every hour.
The new membergroup limits work like this:
| Group | Requirement |
| Brand New | 0 posts |
| Newbie | (none) |
| Jr. Member | activity: 30 |
| Member | activity: 60 |
| Full Member | activity: 120 |
| Sr. Member | activity: 240 |
| Hero Member | activity: 480 |
I'm not 100% sure that the membergroups work correctly. Tell me if you see any bugs.
I hope now you understand!

Just search activity in Meta and you'll get lots of explanations. You can get a max of 14 activity points every two week period and you need to make 14 posts to get them. However, you only need to make at least one post in the fortnight period and then you can collect all the missing points at a later date by making the required anount of posts.
+1.
~~MZ~~