Have you got a README for implementing it?
Not really, but i don't think you need one. Just look at a few other jekyll tags and maybe at the tests or source of https://github.com/hotsh/ostatus . If you just want to use it on your jekyll site put it in your _plugins directory (see https://github.com/mojombo/jekyll/wiki/Plugins) but keep in mind that it generates a static html file when you run jekyll, no live updates or anything like that. Any more specific questions?
And it needs ostatus_feed in your _config.yml set to your ostatus atom feed.
I've found another solution for my needs, but I'll bear that one in mind.
I'll integrate that later with another feed