Brands are constantly thinking about how to identify and engage users across multiple devices: phones, tablets, laptops, desktops and everything in between.

FORBES: 3 Lessons Del Monte Can Learn From Playing Fruit Ninja

While weekly metrics can be sporadic, each month you should be thinking about how you can more efficiently attract, convert, and engage your users to show a healthy rate of growth.

FORBES: 3 Metrics That Really Matter for Your Startup

The thinking behind this device is that users can customize products as they see fit, and avoid using scents or ingredients that they dislike or are allergic to.

FORBES: The Top 10 Fashion And Beauty Startups This Year

Many existing Pro users, thinking they would be forced one way or another, took to social media and Flickr forums to vent their frustrations at the potential loss of that limitless space.

ENGADGET: Flickr Pro users are grandfathered in, get to keep unlimited storage for $25 a year

Drawing an analogy with the originality of Steve Jobs, Xu tells how he and his co-founders huddled in a meeting room of the loft for two months, thinking up new mobile apps that would be easy to use and win over lots of users.

FORBES: Chinese Tech Star Jack Xu Looks To PaPa For His Next Hit

With some 700 million members of its own, Facebook is thinking less and less about how to grow that number and more about how to get current users to live more of their lives within its virtual walls.

FORBES: Facebook Is Getting Into the News Business

However, thinking seems to be running the other way: Kindle Fire users will be used to downloading and, more importantly, paying for, content.

FORBES: Kindle Fire Exciting Interest in Android Developers