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Klout revealed a beta version of its new topic pages today, which it hopes will turn the company into something more like a Nielsen-type rating service rather than a vanity metric for people using social media.

The pages are Klout's way of scanning the Web looking for influential discussions and the people who are leading those discussions.

When semantic recommendations service Evri launched two years ago, the product (backed by Microsoft co-founder Paul Allen) was seen by many as a type of search engine. Nowadays, Evri models itself as a topic-based news service; in particular, tapping into the real-time streams of mixed media coming from Facebook, Twitter, YouTube and other sources.

At the recent Semantic Technology conference, I sat down with Evri CEO Will Hunsinger. He called Evri the "topical equivalent of a Facebook stream."

Blog-centric social network MyBlogLog, which just a few weeks ago added lifestreaming to their app, is today launching a new feature that aggregates lifestreams across the network by topic. The streams are presented in reverse chronological order. It feels a little like Technorati's ill-conceived Topics feature, but for all user activity rather than strictly blog posts.