by Angelo Fernandez | @angelobfs In this weekly post we recap the latest social media news, trends and headlines. Sometimes we’ll throw in a few viral videos because after all, it is Friday.

Preview of Ads Coming to Instagram - Instagram wanted to provide a few more details about exactly what ads on Instagram will look like. This is a one-time ad from the Instagram team that’s meant to give you a sense for the look and feel of the ads you will see.

Pinterest Now Valued at $3.8 Billion - Pinterest has completed another enormous funding, this time nabbing $225 million with late-stage investor Fidelity Investments in the lead.

The Tweeting Bra - OgilvyOne Athens designed a special high-tech bra that tweets each time it is unclasped as part of a new campaign for Nestle Fitness.

Police, Schools Tap Social Media to Track Behavior - If you share something publicly on social media, "you should expect the world to read it," said Andy Sellars, a staff attorney at the Digital Media Law Project.

5 Reasons Not to Ban Social Media in the Office - If your company bans you from using Twitter, Facebook, LinkedIn and other social media in the office, that policy is "brain dead", entrepreneur Vivek Wadhwa said.