All good, but still no support whatsoever for audio / mp3 links.
Embedding in IPB4 is great for images and video, but what about audio? Surely embedding a basic HTML5 player is possible when someone posts an mp3 link?
What about login via vk.com and embedding of posts and videos from it?
It's №1 social network in Russia, Latvia, Urkaine, Georgia, Moldova, Kazakhstan, Azerbaijan, Belarus, Uzbekistan, Turkmenistan, Tajikistan, Kyrgyzstan, Israel, and much more other european countries.
It's also fast-growing in a global scope. From the global perspective vk.com already is much more popular than Twitter, Instagram, Linkedin, e.t.c.
I also recommend you use it as an inspiration source for new features and GUI in IPS, because it's very user-friendly resource, with a lot of features which are we can only dream of while using a lot of websites, including facebook.
It also has a well documented API which is very easy to use in any projects.