Most sites, at least dice sites, provide either a login url (Just-Dice, SatoshiDice) or ask for a user name and password (BitDice, PrimeDice).
One of the benefits of Bitcoin gambling is betting anonymously.
There has been a couple of sites however that allowed you to login with your social media profiles, though they seem to be dead now

Do you think sites should offer the option of login via social media profile as well as the normal username/password?
I dont know about this yet I didnt search yet but based on what Im experiencing now that I am log in to a gambling site with twiter google on facebook I can easily get into a earning and profirable world.That trough this online job I can earn and save for the furure.If this kind of work gives life to people everyone will acknowledge it.