I was curious as to whether The Holocron can be used IC for spying/espionage or to gather information and use that information IC (such as current allegiance, previous affiliations, personal history, etc.). I know it's technically a public forum, but I am unsure as to whether it is allowed to be used as an in-game tool.
Yes, in theory the Holocron is meant to be an IC tool; any information that is on there is completely viewable and accessible through IC means. It's literally nothing more than an in-character wikipedia-like site. Only information which would realistically be on such a site should be there.