We've also been working on a Google Reader replacement for the last two years: http://intigi.com. With Intigi, you can import your RSS feeds from Reader (via OPML) and then filter the feeds by your preferred keywords and social signals (e.g., shares via Twitter).

Intigi is a paid service, primarily targeted at marketers, but we do have a number of startups and founders using the product for content discovery and sharing. You can quickly share content you find to social media, a WordPress site, or to an RSS feed (e.g., to connect with IFTTT).

I'm one of the cofounders and happy to answer any questions about the service and would love any feedback, if you decide to give it a test spin. Please email me at mjfern(at)intigi.com.