Yes I read the explanation. Its been over a month though I think since I've had a score of 28. Strange how can you get a score of 100 in 100 days then if it goes only by 14 every 2 weeks? The most you could get I. 100 days then is 84?
How could it be over a month since you had a score of 28 when your oldest post was only on May 14, a little over 2 weeks ago?
You could get in 100 activity in 100 days.
floor(100/14) = 7
7 * 14 = 98
Therefore: You need to have been in 8 activity periods.
Suppose you started posting on the Sunday before a new activity period. That's 2 days of being in your first activity period. Therefore 7 activity periods later (100 days) you have 100 activity.