If you're talking about a real world fake identity (eg. social security, passport, etc) then it seems to come down to falsifying documents or paying off a worker to create the documents for you. This is a lot easier in some countries than others - for example, getting a fake Egyptian passport or Zimbabwe passport is likely to be incredibly easy right now. Once you have the passport, getting a tourist VISA to just about anywhere is generally incredibly easy.
If you're talking online fake identity, way easier. Head over to some local place that has internet access - a coffee shop, etc. Sign up for a facebook account and a google account using a fake name. Well done, you're now a new person.
If you plan to use these fake identities to commit crimes, however, then I wouldn't recommend it. Once law enforcement has a warrant it becomes easy enough to head over to that cafe and tracking someone down is what cops do. But for privacy and posting stuff online? Works 100% as long as you keep your fake traffic completely separate.
If you're talking online fake identity, way easier. Head over to some local place that has internet access - a coffee shop, etc. Sign up for a facebook account and a google account using a fake name. Well done, you're now a new person.
If you plan to use these fake identities to commit crimes, however, then I wouldn't recommend it. Once law enforcement has a warrant it becomes easy enough to head over to that cafe and tracking someone down is what cops do. But for privacy and posting stuff online? Works 100% as long as you keep your fake traffic completely separate.