Re: 'twas a bit more than organizing protests
@Pierre "if he can prove that he was not at home at the time"
"Apparently, he's clearly visible on video at a food store at the time the posting was made"
Sorry but from a technical perspective those points don't prove it wasn't him.
He could have been away from home, but connected via VPN to home (or even by TOR and exiting through his own node) and posting from a laptop or mobile device.
Video of him doing something else at the time it was posted certainly rules out him doing it at that time, but with almost any blog/social media platform there are ways to schedule posts to be made automatically at a certain time whether it be built in functionality or third party.
We're not talking a physical crime that required him to be present here, we're talking about an electronic one that could have been done from anywhere at any time.
Not that these possibilities prove he did it either of course! But if you're going to be a social/political activist aiming to piss off a government with a reputation for dirty tricks, then hosting a service such as TOR which allows illegal acts to be potentially traced back to you is probably not the brightest idea, it leaves you open to blame for the acts of idiots or even government agents out to pin things on you.