i have spent about 364 days on steemit and i have still not gotten hold of the real deal. I love the concept of the blog and its quite great. i have some few questions tho for some you sir 
1.Can steem be mined?
2. if steem can be mined, is GPU/CPU mining possible?
3. witness? what does it mean . how beneficial is it?
4. what happens when one power's down steem?
5.what influences the amount of sbd one gets at up-vote?