The projects mentioned above provide a (more or less) easy way to use Apache Solr as a powerful search engine for Drupal. Unfortunately, the only language that works well with them, out-of-the-box, is English.
So if you run a non-English website, you need to tweak all the configuration files by hand or you lose some of the advantages that Solr provides compared to Drupal's built-in database-driven search. Doing so requires a deep knowledge of Solr and search technology in general.
The entire process gets even more complicated if you run a multilingual website.
StalkScan is a tool that shows all public information for a given Facebook profile.
It doesn't involve any hack or hacking, it just displays public info from Facebook's official graph search.
Please be aware that results depend on privacy settings: if information is set to 'friends only' it will only show up for Facebook friends.
The website itself is ment for a personal privacy checkup, not for stalking.