While you could theoretically add the necessary metadata tags yourself, Jekyll SEO Tag provides a battle-tested template of crowdsourced best-practices.
Jekyll SEO tag is designed to output machine-readable metadata for search engines and social networks to index and display. If you're looking for something to analyze your Jekyll site's structure and content (e.g., more traditional SEO optimization), take a look at [The Jekyll SEO Gem](https://github.com/pmarsceill/jekyll-seo-gem).
Jekyll SEO tag isn't designed to accommodate every possible use case. It should work for most site out of the box and without a laundry list of configuration options that serve only to confuse most users.
*`facebook:app_id` (A Facebook app ID for Facebook insights), and/or `facebook:publisher` (A Facebook page URL or ID of the publishing entity). You'll want to describe one or both like so:
*`logo` - Relative URL to a site-wide logo (e.g., `assets/your-company-logo.png`)
*`social` - For [specifying social profiles](https://developers.google.com/structured-data/customize/social-profiles). The following properties are available:
*`author` - Page-, post-, or document-specific author information (see below)
### Author information
Author information is used to propagate the `creator` field of Twitter summary cards. This is should be an author-specific, not site-wide Twitter handle (the site-wide username be stored as `site.twitter.username`).
*TL;DR: In most cases, put `author: [your Twitter handle]` in the document's front matter, for sites with multiple authors. If you need something more complicated, read on.*
There are several ways to convey this author-specific information. Author information is found in the following order of priority:
1. An `author` object, in the documents's front matter, e.g.:
```yml
author:
twitter: benbalter
```
2. An `author` object, in the site's `_config.yml`, e.g.:
```yml
author:
twitter: benbalter
```
3.`site.data.authors[author]`, if an author is specified in the document's front matter, and a corresponding key exists in `site.data.authors`. E.g., you have the following in the document's front matter:
```yml
author: benbalter
```
And you have the following in `_data/authors.yml`:
```yml
benbalter:
picture: /img/benbalter.png
twitter: jekyllrb
potus:
picture: /img/potus.png
twitter: whitehouse
```
In the above example, the author `benbalter`'s Twitter handle will be resolved to `@jekyllrb`. This allows you to centralize author information in a single `_data/authors` file for site with many authors that require more than just the author's username.
4. An author in the document's front matter (the simplest way), e.g.: