App Advisor helps safe-guard your personal data by telling you exactly which apps you should be cautious of, before they become a threat to your privacy.
Check to see if your desired username or vanity url is still available at dozens of popular Social Networking and Social Bookmarking websites.
Soziale Beziehungen in Geek-Sprache beschrieben ;)
Diese zeigt einem an, bei welchen Social Network man gerade eingeloggt ist
It is an open-source Python-driven tool aimed at penetration testing around Social-Engineering.