How many post can I do in bitcointalk in a day. And also I would like to know that what are the criteria for getting blocked in bitcointalk.
Depends on whether you have a real life hobby or not. I don't, therefore I can spend all day posting. It's not healthy though, you'll get sick. I recommend spending no more than fifteen to thirty minutes posting on Bitcointalk a day, but alas, I don't follow my own advice. That would be about 10 to 25 posts, depending on how social you are.
As for the criteria for getting blocked, anybody can block you, for whatever reason. Mainly, if you are a rational human being, you'll be blocked by white supremacists for speaking out against bigotry. If you meant blocked from posting by the administrator, you would have to had broken one or more of the rules of Bitcointalk, which you read before signing up (right?)
One of my friend got blocked just for posting 10+ in a day. Does that make any sense. Even he hadn't posted any illegal or scamy content. I don't know what sort of algorithm bitcointalk usage.
Humans moderate content, not bot algorithms. I post a lot more than that daily but I have only had one post removed this year. It's all about being relevant, and not pissing people off.
I would be happy if you could suggest me best and high paying signature campaign.
Also, if you're looking to post simply for signature campaign revenue, I'll have you know it's very inefficient. You're better off making Adsense revenue from blogging or something similar. I mean, 15-30 cents in BTC per post, we're talking less than half of minimum wage here. Let your revenue complement your posts, not the other way around.