Actually, that doesn't work in general... 50% activity moves you from junior member to member. 6 months joined time moves you from member to senior member.

100% activity means that you visited and posted at least 4 posts every day for the past 30 days. 50% can be acheived by doing this for a bit less than two weeks, or by visiting every day, posting at least once a day and sometimes twice for 30 days. "Spamming like a motherfucker" is likely to only frustrate those attempting to gain status quick, since you have to post over a long period to gain activity, and "spamming like a motherfucker" is likely to get you banned. I advise that you just make a habit of visiting everyday and participating in conversation, and you'll be at 50% in no time.