What we need is strong fundamental protections of "rights", which no representatives can overrule.
Direct democracy can be far worse, since when the majority becomes fickle and wants to kill someone (such as Socrates) who is there to stop them? And worse, it's usually the VOCAL ACTIVIST minority that goes and votes or intimidates others, such as the nazi party.
Thinking direct democracy will solve everything is naive. Here are some links:
http://en.wikipedia.org/wiki/Public_choice#Special_interests
And by the way getting 25% of people to vote is not easy, without fines being imposed on the non-voters. Facebook wasn't even able to get 3% of people to vote, and that was online clicking a button.
Publius (federalist papers) wrote about democracies that they: have ever been spectacles of turbulence and contention; have ever been found incompatible with personal security or the rights of property; and have in general been as short in their lives as they have been violent in their deaths. (Federalist 10)
The founders of the USA are kind of like the writers of the initial codebase and the protocol for amending it. Before there was programming, there was ... legal constitution writing.