The Stream Ruby SDK by Stream allows to interact with the API to access activity stream and news feeds data. It contains installation and usage. Complete documentation is available at http://getstream.io/docs/
Push is the new pull. And everyone's doing it. If you're still pulling, it's probably about time you stopped all of that, as Twitter announced on Monday that they are opening up the Site Streams beta. App developers are salivating at the prospect of all those status updates being showered on them from Twitter's engorged hosepipe.