Is it possible to run electrical appliances from the telephone socket?

I've been puzzling over this and hope someone who's knowlegable about telephone lines can shed some light. I would appreciate serious answers please. Please do not hesitate to be technical if you have to, thanks! Is it true that the telephone sockets in our house can actually supply enough electrical power to run appliances? If so, what is the typical load it can supply? Is there an chance that I can overload the telephone socket? What would be the consequence of overloading the telephone socket? Would it affect the whole neighbourhood's telephone network? If using electrical apliances from a telephone socket were possible, then I have another question. So the electrical power from a telephone socket is not metered is it? If that were true, wouldn't I be able to run appliances using the telephone socket as a power source without paying for electrical bills? Would the telephone network company be able to register an unusually higher load on the telephone sockets from my house? Please take my question seriously. The reason I'm asking is because I have come across electrical appliances being sold on the internet that is meant to be run from a telephone line. For example I came across a LED table lamp that runs from the electrical current of a telephone socket. If you don't believe me, just search google. Manufacturers really make such appliances that run from telephone sockets