https://bitcointalk.org/index.php?topic=178608.0The way activity is calculated:
Quote from: theymos on June 18, 2013, 08:44:42 PM
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 30 minutes.
Jr. Member: 1 post written over 4 hours ago, gets 1 gold coins under his name.
Member: Activity: 15, gets 2 gold coins under his name.
Full Member: Activity: 60, gets 3 gold coins under his name.
Sr. Member: Activity: 200, gets 4 gold coins under his name.
Hero Member: Activity: 400, gets 5 gold coins under his name.