Artificial Intelligence:

Artificial Intelligence has been talked about for many years, and has been incorporated in many movies such as Transformers, where the actual transformers are a form of artificial intelligence because they are able to have emotions and think for themselves.

The definition of artificial intelligence is 

1. the theory and development of computer systems able to perform tasks normally requiring human intelligence, such as visual perception, speech recognition, decision-making, and translation between languages. (Wikipedia)

Robots can be useful because they will carry out actions without response and without question, they also have no limits, they are as strong as the creater makes them. Robots have no limits themselves, they are as good as the creater and therefore they can be programmed to do anything, including going into dangerous environments for humans, such as radiation zones. Robots were used in the Japanese tsunami disaster to asses the damages of the radiation leaks.

However, robots can also be very dangerous, as well as carrying out any useful commands out with out question, it will also do any bad act without question, as they cannot discriminate between the two.

I believe that right no robots pose no threat to humans and society, because they have not been programmed to act on their on behalf, but are controlled by people, i believe they pose the same or even less then any weapon in the world. 

However, one day  progrmmes might be programmed to learn to learn, and self evaluate and self asses, at this point i believe that they will become a threat to humanity, as it will have access to all the information on the internet to use. Also, leading scientist Stephan hawking has said that artificial intelligence will pose a threat to humanity. 

You can see what he says at the link: http://www.bbc.com/news/technology-30290540