Tick the languages you speak. The map shades countries by what fraction of their population you'd be able to talk to. Adding the right second language is often more leverage than you'd expect — Chinese is the obvious one, but Hindi adds 180 million in a single click.
Data: 2004 snapshot of speakers and country populations (150 languages, 213 countries). An asterisk on a country mark means that language is a second language there. Background: Learning languages 4 at a time — the original post about scraping the language data and what you'd actually need to learn to talk to most of humanity.
Successful and fortunate crime is called virtue.