By sending any amount of SBD to @tipU you create a deposit.
When you are sending tips (by writing tip! in the comment) @tipU will use Steem Dollars in your deposit to send the tip.
You can withdraw your deposit any time you want without any fees or restrictions. Just send any amount of SBD (for example: 0.001 SBD) to user @tipU with memo: withdraw
Apart from the ability to send tips quick and easy, @tipU will share half of its profit with every user that made a deposit.
This is done to provide a bank-like functionality on steemit where users earn interest from their deposits. Hopefully it will also encourage users to send more tips.
Absolutely yes - for example, if you send a tip! @tipU will automatically add a comment informing the post author about your generosity ;)
If you wish to learn more - please feel free to follow those detailed guides:
Ps. Please don't tip! this post - @tipU won't send tip to itself :)