Great new branding by Red Antler in NYC for Foursquare and Swarm. I love the distinct and opposite approach for each one with Foursquare taking on a very strong, powerful visual feel while Swarm is warmer and more inviting to the user. Both feel very appropriate for each brand.
A lot has been made of Airbnb's new logo on the internet recently and I can only imagine that while the reaction probably isn't exactly what they had in mind they are ecstatic to be receiving so much free publicity. My personal take is that it is clean, beautiful, inviting and friendly, all of which are characteristics of their community-based sharing platform so it works! In a few months the criticism will all be forgotten and Airbnb's brand identity will be firmly established. Well done!