Spirit

Set your Tweets to disappear with a simple hashtag

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Discussion
HunterHiring
Caused quite a stir when it first launched as everyone was still buzzing around Snapchat
@jtzou shared this a while back on MessageMe. Neat concept. Could be useful for marketers / companies to use for promotions or expiring deals.
Total bummer: it doesn't work anymore. The dev told me so on Twitter (due to API changes). But now I can't find his tweet, so maybe he's got something secret working again, haha.