Facebook recently posted a 72% year-over-year gain in Q1 revenue, is stealing share of the online ad market from Google at a slow but increasing rate, and is growing mobile ad revenue by 30% year-over-year.[1]
It's not doing that just by introducing new ad space and new ad formats. It's not doing that by bleeding out existing advertisers. As much as we might not want to admit it, Facebook is becoming a pretty compelling advertising platform. This was not always the case. But the company's ad platform is maturing significantly. It's got a long ways to go, and it's not perfect by any means. But there's a lot of potential yet to be tapped, and by all accounts, the company is making progress in tapping it.
News of Facebook's supposedly declining popularity is also premature and exaggerated.
[1]http://online.wsj.com/news/articles/SB1000142405270230338000...