[cf0ed2aa-bdf5]

There is also his campaign site "Redditors for Obama" https://barackobama.com/reddit

Not definite proof but if someone hacked the POTUS's Twitter Account and posted a fake IAMA to reddit it would probably have been shut down by now.

[RandallBrown]

The Redditors for Obama wasn't there the first time I had the page load. That definitely helps the legitimacy.