How is the new antibot feature working? Should I select nastyhosts.com from the dropdown?
With nastyhosts.com selected it'll ask nastyhosts.com about the IP address of user before sending coins to him. If it's on the blacklist, it'll be denied.
There are many reasons for which you may want NOT to enable it and why it's not enabled by default:
1. you're sending your visitors IP addresses to 3rd party, they may not like it and I think that in some countries you may be forced to mention that in Privacy Policy...
2. it's a simple blacklist of known networks, so many will still get through
3. collateral damage may happen as real users may get denied
4. it increases the load on your server, as now it has to connect not only to FaucetBOX.com, but also to nastyhosts.com
So it's up to you whether you want to enable that feature or not.