Posting pictures on the internet is far different from lynching someone.

The court system and government should treat people as innocent until proven guilty. Private citizens have a lower responsibility.

At no point did the original poster claim that man stole his laptop - he merely stated that his laptop was stolen and posted pictures of the man currently possessing the stolen laptop. Other people assumed this man stole the laptop, which may or may not be accurate.

The man is in possession of stolen property. At some point we need to balance the owner's rights to retrieve stolen property against the right's of a man possessing stolen property to retain complete anonymity.