What's New: Foursquare, Twitter, Reddit

* Foursquare passes 3 million users, lights up Times Square.

* The top 10 Twitter trends last week.

* "Silly" Facebook app propels Stride Gum.

* Lawsuit aims to block teens from "liking" ads on Facebook.

* Older adults nearly double social media presence.

* Cheezburger Network CEO Ben Huh makes a bid for Reddit after Conde Nast flap.

* Google continues social buying spree with Angstro.

* MySpace fights for relevance and mindshare.

* Bravo, MTV and the History Channel are among "most effective" media brands on Foursquare.

* Twitter and Facebook: "Recess for Grown-Ups"?

* Drug companies and marketers need to monitor their brands on social media.

* A new survey says Facebook feeds narcissism.

* Germany prohibits employers from checking out candidates' Facebook profiles.

* Yahoo's social head quits to join eBay.