Apparently, Reddit doesn't support AdWords, we would have to use their own engine and that's an inconvenience (new expense, new vote, new pecularities etc). Anyway, we have tried it twice so far, if I remember correctly. Both times cost-per-click turned out around 21-22 cents. If we assume the same bounce rate (~80%), that's probably too wasteful.

https://cryptocointalk.com/topic/1331-new-coin-launch-announcement-grc-gridcoin/page-1120#entry210775

https://cryptocointalk.com/topic/38158-reddit-ads