The point of these API-based companies is usually to gain a foothold and some user traction and then reduce their dependency on the mothership once they've got some leverage.
It's pretty obvious that a business that's completely dependent upon FaceBook isn't in a very good position. It's equally obvious that a business that's completely dependent upon FaceBook but has users is in a better position than a business that nobody cares about. You start with the latter, not the former.
If Greplin or some other startup is still dependent upon FaceBook after years gone by and $5M spent, they're doing something wrong. But in the near-term, they're doing a helluva lot better than the average startup.
It's pretty obvious that a business that's completely dependent upon FaceBook isn't in a very good position. It's equally obvious that a business that's completely dependent upon FaceBook but has users is in a better position than a business that nobody cares about. You start with the latter, not the former.
If Greplin or some other startup is still dependent upon FaceBook after years gone by and $5M spent, they're doing something wrong. But in the near-term, they're doing a helluva lot better than the average startup.