We have a very similar feature on https://feedle.world. Every search has its own dedicated RSS feed that can new followed directly, as well as an iframe that can be embedded on other people’s websites. This way, anyone can build accidental blogrolls, based o topics of interest.

P.S. for people whore not really into RSS, we are also Beta testing the option to subscribe to searches and get results in email digests. Same idea, but you don’t need to bother finding an RSS reader.