bitbug.io

Bitbug Meta Tags lets you control how your site appears when shared on social networks and in browser tabs:
<ul>
<li>Open Graph & Twitter meta tags — Outputs <code>og:title</code>, <code>og:description</code>, <code>og:url</code>, <code>og:image</code>, <code>og:type</code>, and <code>twitter:card</code> in the head for singular posts, pages, and the front page so links show the right title, description, and image on Facebook, Twitter, LinkedIn, etc.</li>
<li>Per-page favicons — On any post or page you can set a custom favicon (and apple-touch-icon / tile image). When someone visits that URL, the browser tab shows your chosen icon instead of the site-wide one.</li>
<li>Front page defaults — In Settings → General you can set a default Open Graph image for the homepage. Recommended size for the site image is 1200×675 px.</li>
<li>Per-post/page overrides — On the edit screen for posts and pages, two side meta boxes let you choose a Custom Favicon and a Custom Open Graph Image for that content. If you don’t set them, the plugin falls back to: post OG image → featured image → front page OG image → site icon → theme default-og-image.jpg.</li>
</ul>

Bitbug Meta Tags

Add Open Graph meta tags and per-page favicons to improve social sharing and branding.

NextPlugins

Lightweight SEO plugin.
<ol>
<li>Upload the plugin files to the <code>/wp-content/plugins/plugin-name</code> directory, or install the plugin through the WordPress plugins screen directly.</li>
<li>Activate the plugin through the ‘Plugins’ screen in WordPress</li>
<li>Optionally add <code>define('NP_LIGHTWEIGHT_SEO_POSTS', 'post, page, my_custom_post_type');</code> in wp-config.php to enable SEO fields in Posts, Pages and custom post types</li>
<li>Optionally add <code>define('NP_LIGHTWEIGHT_SEO_TAXONOMY', 'category, my_custom_taxonomy');</code> in wp-config.php to enable SEO fields in Category and custom taxonomies</li>
</ol>
By default SEO fields will be added to Posts, Pages and Posts Category.
By default Post featured image is used for Facebook (og:image) and Twitter (twitter:image) images. 
It is possible to add custom image using <code>next_plugins_lightweight_seo_post_image</code> and <code>next_plugins_lightweight_seo_term_image</code> filter. 
In both filters you need to return array containing image url and sizes. 
Returned array example: 
 array(‘url’ => ‘http://www.my-full-url.com/image.jpg’, ‘width’ => 300, ‘height’ => 200)

Bitbug Meta Tags vs NextPlugins Lightweight SEO