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You can keep yourself sane and find his replies by looking at his profile page at https://www.reddit.com/user/ElonMuskOfficial

You can sort the comments by Question & Answer to have not only the answer https://www.reddit.com/r/spacex/comments/590wi9/i_am_elon_mu...

Ah nice, didn't know that!

Or you can use the browser find feature and use 'ElonMuskOfficial' to find the responses.