[rehack]

Yes, that's possible. But then it will be doing something new and different, isn't it? And it has to be more based on the spending power it has. And not related to its social network power.

Google put G+ on its home page, with not much success. Similarly, why should FB get a leverage out of just putting search on its home page. Unless the search is really better than Google's. What advantage FB has over say blekko in competing in search?

[hackinthebochs]

They don't need to do anything new or different. The barrier to a user to use a new search is miniscule. It's even less if you're already spending 90% of your online time on that site to begin with. G+ didn't work out because there is a huge barrier to users to become active on it. The two are vastly different.