Just one more thing I'd like to add which hasn't been mentioned yet:
The 14 day periods are global and the same for everyone. They are not synchronized with your registration. And if you want to get really technical then it's not exactly 14 days but rather 1,210,000 seconds so the start of each period drifts over time. The current period began on March 3, 2015 at 10:53:20 UTC. The next period will begin on March 17, 2015 at 11:00:00 UTC.
i think You have to do constructive Posts under bitcoin discussion and beginners & help with more than 75 letters
Unless the rules have changed recently, this doesn't sound right at all. In fact, this sounds like the rules for Bitmixer.io's signature campaign although they only don't count posts made in off-topic, games & rounds, alternate cryptocurrencies, and their thread.