Investigate occasional double posting

[joealcorn]

[alexanderpas]

Quad post here:

https://www.reddit.com/r/admincraft/comments/3bmgc7/looks_like_quivers_are_no_longer_going_to_be_a/

Suggestion: Store an list of posts already replied to, and don't post to those again.

[4DEATH]

Double post here:

https://www.reddit.com/r/dotamasterrace/comments/3h3phv/redeye_told_his_friend_to_try_dota/

[EvilGrinUK]

And here

https://www.reddit.com/r/unitedkingdom/comments/3htzl1/andy_burnham_calls_for_urgent_meeting_over/

[twnr]

https://www.reddit.com/r/kpop/comments/3uflar/unpretty_rapstar_and_show_me_the_money_to_be_on/

Double post here