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[Potterverse] Does the wizarding world have instantaneous/light-speed communications?

The Weazleys have a clock-like object which tells you where people are at any time. Does it update instantaneously or at least at the speed of light?

At some points it seems they need to wait for newspapers to find out what was going on, but at other times it seems they have a form of radio. Also speaking to people through fireplaces is a form of real-time communication.

TL;DR: I'm confused.
gpt
Yes.

Wizards do have radio (although only a few stations, and it seems like there's more music than news on). IIRC we never see wizarding radios in Hogwarts itself - perhaps the ambient magic messes them up, just like mundane radio? Radio-based news was important post-Voldemort takeover, because it's harder to censor than print, and there's a spell that "password-protects" radio broadcasts so you can only tune in if you know the code word.

The floo network is used much like a phone in addition to the full-body teleport, by sending only your head through to talk to someone.

Portraits are also used as a form of communication in the series, primarily the portrait of Phineus Nigellus in the Black house and an unnamed portrait in the Muggle Prime Minister's office that arranges meetings with the Minister for Magic with him (and watches him.) This isn't *quite* instant, since you talk to the portrait and then they talk to the recipient, but it's fairly quick.

Paired objects that can be used for instant communication - magic mirrors and coins with coded numbers worked into the design are the only ones we see, but presumably others are possible. These require difficult spellwork to make, though not *that* hard, Hermione and Draco both do it. 

There are also several rarer methods shown:

 
* The Dark Mark, although it can only send one "message" as far as we see - a summons to (or from) the Dark Lord. 
 
* Patronuses can teleport to anyone's location and deliver (verbal) messages, although it's not their primary function. Of course, most people can't cast the spell. The Order of the Phoenix used this, most notably to spread word of Voldemort's coup before the Death Eaters arrived.
 
* We see Dumbledore send letters and signal instantly using Fawkes, although obviously pet phoenixes are incredibly rare.

EDIT:

>At some points it seems they need to wait for newspapers to find out what was going on

What they *don't* have is an equivalent of the Internet. If they want to read the day's headlines all in one place, rather than hope a relevant story comes on the radio or hope someone they know personally heard a story and tells them about it, then they have to use newspapers and magazines.