Cards should be fine.
Index Title Question
How to change the title of index page?
I've already change in ACP but still show "nodebb" everytime i share in facebook.
Ah, what page is this? I just hopped on a random NodeBB forum and didn't repro this issue
my homepage. eg. http://example.com/
when i share it to facebook it still show the "nodebb" on index title.
Try your url at https://developers.facebook.com/tools/debug/ with no caching, facebook usually caches the og data.