login

Many social networks like VKontakte, MyKrug, etc. require to view someone's login data. That is so unobtrusively forced to register on the site. Well, of course, people who already had the good fortune to register there will automatically throw links to instant messengers, publish on blogs and otherwise advertise the resource.

I understood why this method pushes me away: if I take a business card from a person, I do not have to order my business cards at the same printing house as he does.