Not just searchable, but easily searchable makes a HUGE difference. A well thought out forum is searchable, indexable, and very well organized unlike Facebook Groups & Twitter (largest social media networks). The downside is, just like all other networking sites, it takes a little time to understand HOW it works. The biggest hurdle in any social network is to understand HOW to participate and gain value. Engagement is critical in a forum, otherwise, it's just a website. If you have questions about HOW to engage, please post here.