Using the free api from IPInfoDB (Free IP address geolocation tools) we are able to add to your joomla site user data information like: geographic latitude, longitude, city, nation and therefore we are able to show on a Google map. Please remember that you need your API key. Here is an example of our site members.
The obviously first step is to download the Extension Package from the download site, the AUser Manager is a complex joomla extensions and is made of one component and several modules and plugins, so we have released it as a self-installing package, you don't need to manual install every single piece, the installation Package make all the dirty work for you, so like every other Joomla! extensions log in the administrative side go to > Extensions > Install/Uninstall, in the Upload Package File section click Browse and locate the archive of the AUser Manger Package you wish to install, then click Upload File & Install to upload the file and complete the installation.
In this article i'll illustrate how the Project HoneyPot can help to stop spammer on a Joomla site. The AUser Manager extensions come out with the Detector Plugin, if enabled and proper configured, every time someone try to login or to register to your site the Detector plugin query the Project HoneyPot and depending on the response deny or allow the user login or registration. The feature used is the so called "HTTP Blacklist".
"The HTTP Blacklist, or "http:BL", is a system that allows website administrators to take advantage of the data generated by Project Honey Pot in order to keep suspicious and malicious web robots off their sites. Project Honey Pot tracks harvesters, comment spammers, and other suspicious visitors to websites. Http:BL makes this data available to any member of Project Honey Pot in an easy and efficient way.Http:BL provides data back about the IP addresses of visitors to your website. Data is exchanged over the DNS system. You may query your local DNS server and receive a response back that indicates the type of visitor to your site, how threatening that visitor is, and how long it has been since the visitor has last been seen within the Project Honey Pot trap network."
For more information read the Honeypot FAQ.
For my personsal experience and from what tell's me other AUser Manager users after installing the Detector plugin the number of fake user registrations are drastically decreased.
Joomla by default provides two methods for approve user registration:
click on parameters
the parameter "New User Account Activation mode" is setted for default to E-mail
simply change this value to Approval and save.

Now when a new user is registered to your site, you'll receive (admin) an email informing that a new user is registered at your site would you approve ? For Approve, simply go on administrator -> componentes -> AUser Manager search the user and click on enable. An e-mail is send to the user informing that has been approved and now may login as member on your site.
User Guide
Here are the steps you need to take for set Detector Plugin Api keys and parameter:

Setting the Akismet, HoneypotProject, BotScout, Stopforumspam api key is mandatory to use that webservice on Detector plugin. To obtain an Akismet API key, you simply need to register for a WordPress.com account at http://www.wordpress.com/signup Don’t worry, API key for Akismet comes for free and it takes just a minute to generate your unique Akismet API key from Wordpress. In the same way for use the HoneyPot webservice http:BL, each user of http:BL is required to register with Project Honey Pot (www.projecthoneypot.org). Each user of http:BL must also request an Access Key to make use of the service. For Botscout go here to get your free key, and an API key is also required for Stopforumspam here you can get one http://www.stopforumspam.com/signup
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