Facebook has seen extraordinary growth in the last year, and now boasts over 350 million users, with 50% of their active users logging in every day.

It’s clear that their platform strategy is paying off, with more than 350,000 active applications deployed on the Facebook platform, and more than 15,000 websites, devices and applications implementing Facebook Connect in the past year.

Some applications have managed to build massive audiences, with Farmville clocking up 69 million+ active users, Causes attracting 34 million users, and Cafe World serving in excess of 30 million users.

After 6 years of investment and growth, LinkedIn has managed to grow to somewhere north of 50 million users.

This raises a question for me – if LinkedIn were to launch today, with the benefit of seeing how the Facebook Platform has grown to dominate the social networking space, would they create a new service, or would LinkedIn be a business networking and recruitment app built on top of the Facebook platform?

I’d love to hear your thoughts – drop me a comment below…

Related posts:

1. LinkedIn profitable, Facebook not so much
2. Farmville vs. LinkedIn
3. My first real LinkedIn spam