How do I see the "recent history"?
Go to you browser search "steemdb.io"
Click on the lift three line and click account
Type in your Username and scroll down
How do I check the different activities: Posts, Votes, Reblogs, Replies, Reblogs, Rewards, Transfers, etc
Click on activity.
You will see Posts, vote and Reblogs etc.
How do I know who has reblogged my post: (Social: Follower, Following, Reblogged)?
click on social you will see followers, Reblogs and following click on the one you want to see.
How do I check my Voting Power?
When your steemdb.io opens enter your username and scroll down you will see you voting power.
Thanks to @cryptokanon for the lecture on how to use steembd.io.