Depends where you go. Japan and Sing. don't have as much homelessness but China, Malaysia, Thailand, Indonesia, Philippines, etc. does.
Europe also depends as well, Lithuania in the early 2000s was pretty ugly as were some other parts of the Former Soviet - heaps and heaps of street kids. Paris has some pretty dang ugly places too.
I haven't been to San Fran since the early 1990s and the wharf had it's fair share of beggars but not that many. I've been in Texas during a northern winter as well and the place filled up with them as apparently there is a panhandler circuit where they follow the milder weather.
Ah, not really, it doesn't. During the Olympics, Expo and big international events it does but you can also include anyone who isn't a registered city of those towns. When I lived in China I used to feed my local beggars a couple of times a week, couple of old blokes. When my parents came to visit they were really nice and helpful to them, heart wrenching stuff.