Breakups, death threats, and temper tantrums — this week’s theme is “think before you speak.” This advice applies equally to individual social-media users, companies, brands, and celebrities. So take heed.

Five themes top the list. And there’s a thread running through these topics: Foursquare and Gowalla. They create lot of buzz across multiple categories. Here’s the Networked Insights Buzz Report from SXSW 2010.

Tweets from astronauts and the NCCA Tourney on your phone? You betcha. There’s an app for damn near everything these days. Get with it people.

Marketing experts are telling Toyota that it needs to rebuild the trust of women in the wake of the recall mayhem. Social-media listening can play a critical role in campaign design, helping to fill in the gaps left by traditional methods.

Traditional media continues to struggle despite more focus on the consumer and growing social-media adoption. Throw in some patent-infringement lawsuits and it’s just another week in the life of new media.

The 2010 Winter Olympics have become a laboratory for how events and advertising play on the second screen. Most of the “experiments,” the way we interpret social media data, are focused on how consumers behave in social media. But what we can learn from 300 million people interacting online should inform all aspects of marketing.