Just about all USB midi keyboards/controllers are cross platform. I fail to think of one that isn't, to be honest. So save yourself a few bucks and pick up an Akai MPK or something like that...
Indeed. For reference, here's a link to Thomann's catalogue with over 50 of such mini MIDI-keyboards.
Sometimes I don't understand how people avoid running away screaming in terror.
Because the Big Brother aspect is hidden in daily use of these services, and at the same time they provide people the benefits of a powerful communication tool. Pretty simple really.
It's the same reason why people buy unethically produced goods: because the manufacturing process is hidden from them, but the price is cheap.
BLISS is ignorance.