BANGALORE, INDIA: Networking giant Facebook, who filed for an initial public offering (IPO) on Wednesday and is valued somewhere between $75 billion to $100 billion, said that it had invested over $1 billion in infrastructure to powers its data centre network.

The 845 million user base strong, social networking company let out these information in its S-1 registration statement published recently. The company said that it had spent $606 million on servers, storage, network gear and data centres in 2011, and expects to spend another $500 million this year.

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"Cash used in investing activities during 2011 primarily resulted from the use of approximately $2,396 million for the net purchase of marketable securities. Our cash used in investing activities in 2011 also consisted of capital expenditures of $606 million related to the purchase of servers, networking equipment, storage infrastructure, and the construction of data centers," Facebook said.

The social networking website store over 100 petabytes (100 quadrillion bytes) of photos and videos as of today. And in order to support its network has 'built a number of storage and serving technologies, such as Haystack, which allow us to efficiently serve and store We developed Apache Hive, a data warehouse infrastructure built on top of Hadoop, to provide tools to enable easy data summarization, ad hoc querying, and analysis of large datasets', it added.

In 2011, Facebook started serving its products from its own data centres and plans to continue to expand the size of its infrastructure, 'primarily through data centers that we design'.

Its products are built on a shared computing infrastructure.

"We use a combination of off-the-shelf and custom software running on clusters of commodity computers to amass substantial computing capability. Our infrastructure has enabled the storage and processing of large datasets and facilitated the deployment of our products on a global scale. As our user base grows, and the level of engagement and sharing from our users continues to increase, our computing needs continue to expand."

"We aim to provide our products rapidly and reliably to all users around the world, including in countries where we do not expect significant short-term monetization. We expect to benefit if and as the per-unit pricing for computing power, memory and storage capacity continues to decrease. We also intend to continue to develop data center and server architectures that are operationally efficient, scalable," Facebook added.