The difference is context within my social network. None of my friends have Google Profiles and are unlikely to reconstruct their graph on Google Profiles. Clic

The difference is context within my social network. None of my friends have Google Profiles and are unlikely to reconstruct their graph on Google Profiles. Clicking +1 doesn't have as much social distribution as the Like button because of this fundamental problem. Facebook already has all my friends on it, so clicking a Like button actually has weight.