Like Facebook Open Graph Tags, Twitter Card meta tags are auto generated.
Slim SEO uses Summary Card with Large Image, so the posts appear beautifully and more attractive on Twitter.
It’s important to understand that Twitter Card supports Open Graph. So, it’s redundant to output the duplicated tags.
Instead, Slim SEO only output needed tags. Here is the reference:
|Card type: always |
|Title: uses Open Graph tag |
|Description: uses Open Graph tag |
|Image: uses Open Graph tag |
|Image alt text: uses Open Graph tag |