Facebook’s future as an important social network, certainly in the business world, is under increasing pressure from Twitter, warns Richard Greenfield, media analyst at BTIG Research.

Greenfield cites an important interview between David Fischer, Facebook’s VP of Business and Marketing Relationships, and Adam Lashinsky of Fortune, which took place Wednesday, as evidence. The interview wasn’t televised or available as a webcast, and nor did any notable discussion take place on Facebook. Instead, the audience of more than 500 immediately turned to Twitter to share their comments about the event.

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