No. Your understanding of activity is incorrect. Read this:
https://bitcointalk.org/index.php?topic=237597.msg2513302#msg2513302Don't go spamming the boards trying to jump up levels... it doesn't work. As stated in that thread, posting once a day will have same affect on activity as posting 30 times a day.
Posting more than once per day on average is useless for increasing activity. The maximum number of activity points you can get is 1 per day, but your activity score only updates every two weeks.