Wow... so many users.. Perhaps asking the Google+ guys.. =) The only idea I have right now, is use taskqueues (or in the same request, it depends on latency) to create a «notification», referencing the post, and the users. Then, list the most recents notifications for the user. Delete the old ones through a cron job. Anyway, I have to say that having the notifications for 200.000 users in my news feed would not be a very pleaseant experience, they will change every nanosecond!
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