Signature campaigns are the best way to earn some Bitcoin. Especially if you are Jr. Member or Full Member which has a high payout rate. Don't lose time with faucets. They give you very low BTC

and how about others not only full members? bigger rank accounts have even better pay rates, what means its really beneficial to evolve your account and participate in such campaigns
Of course. Newbies and other ranks can earn from signature campaigns too. I was just stating that higher ranks get higher pay. By the way...how come I have around 225 posts and my rank hasn't been updated? Any idea on how increase rank?
It depends on your activity rank. Activity rank updates by 14 counts every 2 weeks if you post at least 1 post. Next acitivity update will be on August 4.
Can you tell me the difference between post and activity, please? Because i see my acc for example, post and activity are equal, but some others acc are not same.
Post is your reply or post in different thread like what you do when you reply this statement or this question. Activity post is the reference to know you rank for example you will become full member when your activity points is more than 120 points. And the way to earn or to gain activity points, just post 14 post in every 2 weeks and you will get 14 activity points.