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I will note that I favorited the tweet, and within seconds David Smooke followed me.

That timing seems just a little... odd.

Maybe he happened to be on Twitter?

Most likely explanation. Someone wanting a bot to be less obvious would use a delay.

lol i was on twitter

Precisely what a HackerNews bot would say...

Pats david on the head sure you are buddy.

The timing of this comment is a bit suspicious.