You're thinking a traditional forum such as this one now, no, absolutely not!
The post office is issued with cards and peoples names (maybe that/drivers licence combo)
The servers can only be accessed by computers inside America/uk/australia, the unique id number issued is the only way in, any replication would be flagged instantly and that person would be contacted or simply suspend the account / contact via email
The "government" would simply consist of embassy members to go to other countries / nations, then two or three IT specialist in networking, hardware etc can maintain these servers with money to spare to pump back into health and education
The government (if you can still call it that) does the minimum required to keep relations with other countries, they can then feedback information to the forum and humans who care vote, if nobody does vote the embasador will but only on unimportant decisions..
Defence can just be another building where people get employed, they return feedback and in an emergency sms messages could be sent out, eg incoming missile from north korea , we have deployed a rocket to destroy it...
vote yes to nuke n korea
Vote no to not
The whole nation then decided what's best, specific parts of the government that we need can simply be run like the post office if buildings are required to service people (army/navy) they do their job give us the most informed info we can and we all vote, if it's a local issue eg, the kids at number 9 keep destroying the kids park
State - suberb - have a local discussion with others, come up with a resolution and then a vote, money can be diverted from the local treasury amount for that suberb eg money used to install a camer or to employ security
The more well off can login as well but because it's a forum they could donate money to other members to do a job, the community stars them for the jobs they do creating employment
The more the community does and donates the more people change suburbs, it all becomes self regulating, customed for the people who live there and their needs
Let's say in darlington 80% of people want euthanasia but the state/the rest that % becomes less than 30%
Darlington the suburb can vote for euthanasia, the law passes, others flock there.. at the moment it's 1 size shoe fits all!