How long do you think it would take facebook to build an app better than Mosoto? You could say "why won't facebook just buy them?" - they could, but nothing say

How long do you think it would take facebook to build an app better than Mosoto? You could say "why won't facebook just buy them?" - they could, but nothing says facebook has much inclination to acquire; they do have inclination to expand their mission. Like its been said before, startups that rely on other networks without explicit agreement are calling for trouble.