Charlie did post a note (he posts them in the upper right sidebar) to everyone saying that there was a cap on how many points you can make in a day. He didn’t say what the number was. I haven’t tried to figure it out, but my impression (and this may be totally wrong) is that there is a cap on each type of activity. You can get so many per day for likes, so many for comments and so forth. I’ve never seemed to stop getting points in a day’s time, but seem to stop gaining them for certain activities as I go along.