Web 2.0 has often been described as "the Web as platform," and if we think about the Web as a platform for interacting with content, we begin to see how it impacts design.

人们常常把Web 2.0描述为“作为平台的网络”，把网络看成是一个内容互动的平台之后，我们很容易发现这种变化对于设计的重大影响。

youdao

New Mozilla-proposed APIs that advance the Web as a platform and will be submitted to the W3C for standardization.

ENGADGET: Mozilla Labs Apps set to allow developer submissions for Mozilla Marketplace at MWC

The term Web 2.0 describes the post-dot-com generation of sites and services that use the Web as a platform--things like Flickr, BitTorrent, tagging and RSS syndication.

FORBES: Magazine Article

In a deeper sense, YouTube is following the classic Google strategy of using the Web as a platform to empower more developers, creating a swarm bigger than anyone else can find.

FORBES: YouTube's Scale Disrupts Us All