Facebook is about to spend big on upgrading its infrastructure. According to Business Week, the social network has closed a deal to take a $100 million loan (“venture lending”), all of which will be spent on new servers. Facebook gives up no equity as part of the deal. Business Week explains how this type of loan works:

“Venture lending peaked during the dot-com bubble of the late 1990s and early part of this decade, but is making a comeback as startups use debt to pay for computer servers, telecom gear, and software … The TriplePoint lease has a degree of flexibility not offered by a traditional loan. For instance, Facebook can exchange or replace equipment during the term of the lease.”

Essentially, it’s a really, really huge credit card, with very favorable terms. In all, Facebook has now raised in excess of $300 million, including $240 million from Microsoft, $100 million from Hong Kong billionaire Li Ka-Shing, and an undisclosed amount from the Samwer brothers.

As for the servers, Business Week estimates the $100M will be used to buy roughly 50,000 servers. Last month, Data Center Knowledge published a report estimating that the social network currently has around 10,000 servers in operation.

The new money comes from TriplePoint Capital, and is the firm’s largest deal to date.