SearchBook is currently down as Facebook has made more changes to their graph search. Stay updated on Twitter in the #OSINT community for more news.
There are a few tools out there that still get the job done. IntelX has a free Facebook Graph Searcher tool that has been working quite well for me. MSIS reached out stating they have a completely different solution than the Graph Search. Make sure to check out the SearchBook article on https://jakecreps.com/2019/06/24/searchbook/ for a little bit of background on the recent changes to