Facebook, the world’s biggest social network, is selling more ad spots to big companies like Wal-Mart Stores, Procter & Gamble and PepsiCo.

But the site’s pages are also home to countless ads from smaller companies that can be funny, weird or just plain creepy — those suggesting you are, say, eligible to get a free iPad because you are exactly 26 years old, or entreaties to see what your offspring would look like if you had a child with a celebrity.

Here’s a collection of terrific social media infographics that might come in handy. As you probably know, infographics are visual representations of information, data, or knowledge. They illustrate information that would be unwieldy in text form and they act as a kind of visual shorthand, making information easy to understand and consume.

About 80% of all US physicians will be using smart phones by 2012, and not just for drug reference or clinical information. An explosion of new healthcare professional-facing apps - over 1,500 in Apple's app store alone - will expand mobile device usage to include patient care and administrative functions, according to Manhattan Research survey.

Ok, so what is the difference between “search” and “social media” marketing? It takes so little lately to make me feel like a dinosaur. I vaguely get this: people are bouncing around between Facebook, Twitter, LinkedIn, Google to find everything from a job to a date to a product—but I wasn’t really sure how this could be used to market anything, at least market in some systematic, strategic way.

Baby boomers are on the verge of adopting smartphones and the mobile Internet, and in the vanguard of this movement are younger boomers. But boomers’ mobile Internet adoption rates will be similar to their social media uptake—that is, slow. They must see the benefits before they sign on.