Got threads? Online communities are among the most popular tools used on the net. However, these tools have had limited refinement over the last two decades and are now reaching their limit of utility, as volumes rise beyond the abilities of mere humans to keep up. This talk demonstrates several technologies and concepts that show promise as ways to enhance online communities, making them easier to discover and making it easier to select high-quality content, evaluate that content, and motivate others to contribute significant value. In short, these tools may catalyze collective action by highlighting participants' histories and relationships. [recorded at the O'Reilly Emerging Technology conference]