My competitors Facebook group ranked on google

I have seen my competitor is ranking with his Facebook group with the keyword...


When someone search "best ____ in ___" his Facebook group is shown in top of the results...

I already have an Facebook group..

How can i rank like him..

Make sure the group & posts are publicly visible (otherwise, it won't be crawled/indexed),
The rest will be about building links, it's just another page, more authority will get you better ranking