code: @Override
  	public boolean isAvailable(Context context) {
  		return authProviderInfoBuilder.isSupported(AuthProviderType.FACEBOOK) && 
  				(facebookFacade.getSDKMajorVersion() == 2 || appUtils.isActivityAvailable(context, "com.facebook.LoginActivity"));
  	}
docs: /* (non-Javadoc)
  @see com.socialize.networks.facebook.FacebookUtilsProxy#isAvailable(android.content.Context)