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Well, not to slam Reddit on hubski.... But who cares? Seriously, if I miss a comment or two comments get out of order, but the code is 10x faster and easier to maintain, let's put that in the win column and move on.
Google results are different from different data centers at the exact same moment because of code and crawler propagation. Seems to work fine for everyone. Most software communicates with TCP instead of UDP and that seems to work fine. -XC
Less about reddit than just a generic imagined scenario of running a large, distributed message-board system and how you just have to think a bit more and be aware of the trade-offs that you can (And probably should) make.
Also, I wasn't referring to TCP/UDP, rather large networks of computers, where things regularly break and it's hard to get the atomic synchronization that locks give without throwing performance out the window. Algorithms like mapreduce are built to mitigate the fact a fraction of servers in a cluster will regularly fail/stall.