The "socialness" of Israelis is not consistent across Israelis.
Secular Israelis tend to be more social with outsiders than Religious Israelis, but Religious Israelis tend to be more social with each other than Secular Israelis. People in small towns tend to be more social than people in the larger cities.
However, in general, Israelis are more than willing to converse, but they might come off a little harshly. Israelis often compare themselves to cactus fruits (sabras) in that they have a thorny exterior but a sweet interior.