This is eerily similar to traffic for a site I posted here and on reddit recently. Is there a name for this kind of traffic? Looks like a huge spike from 1 sour

This is eerily similar to traffic for a site I posted here and on reddit recently. Is there a name for this kind of traffic? Looks like a huge spike from 1 source, then a small source reposts it a day or two later, then traffic completely drops off. My example is a blog though, with essentially no reason to return (posts are months apart) http://imgur.com/e7mOrsG http://imgur.com/e7mOrsG