The Rise of Google, the Ascent of Facebook and the Decline of Everyone Else

If you pay the slightest bit of attention to Internet advertising, you know this. But it’s always good to see it spelled out: Google is ginormous! The other takeaways are also old news: Microsoft, Yahoo and AOL are foundering and have been for years (hence their new alliance). And Facebook is starting to generate a real ad business — as opposed to just a very sticky Web site.