Patrick Lai

XLogin enhances the WordPress login page (usually wp-login.php) to 
allow users to authenticate with the following external services:
<ul>
<li>Facebook Login</li>
<li>Google Sign-In</li>
<li>Yahoo! OAuth</li>
</ul>
These services can be enabled or disabled individually. XLogin adds a 
button to the WordPress login page for each enabled service. Clicking 
the button sends the browser to the corresponding external service 
where the user can authorize the WordPress site to access their 
information. Having been granted access to, for example, the Facebook 
public profile of a user, XLogin retrieves their email address to 
find a matching WordPress user to complete the login process.
XLogin also maintains a list of external aliases. They are additional 
email addresses for mapping to WordPress users. Some scenarios where 
external aliases can be handy include:
<ol>
<li>
A user’s email address in his WordPress profile is not used in any 
of the external services. For example, a corporate WordPress site 
may mandate the use of company email addresses in user 
profiles. If a user has for example his Gmail address in the 
external alias list, they can still nevertheless sign in Google.
</li>
<li>
A WordPress user account is shared by a group of actual 
users. With XLogin it is not necessary to have the users share a 
single password. Instead just register their email addresses (as 
known by the external services) as external aliases; it becomes a 
simple matter to add and remove user.
</li>
</ol>
XLogin has the option to restrict an external service to only users with 
external aliases. This allows tight control on who can use external 
services to login.
A user’s profile in WordPress and in the external service may be 
different. Email address is one, and display name (or its component 
family and given names) is another. XLogin offers the option to import 
the external profile information into the current session. The imported 
display name will be tagged with the external service name. For 
example, if a user has display name ‘John Doe’ in WordPress, but is 
known as ‘Johnny D’ in his Facebook account, then he would be 
displayed as ‘Johnny D (Facebook)’ (instead of ‘John Doe’) in his 
WordPress session when he logs in with Facebook.
Finally XLogin has the notion of ‘guest’ user. When an email address 
provided by an external service does not correspond to a specific 
WordPress user, XLogin will proceed with a guest WordPress user 
configured for the service. There are plugins that control access to 
content based on user roles; a site can combine such with XLogin to 
control what is visible to guests. Note that guest WordPress users 
should have minimal privileges. XLogin has safeguards to ensure, for 
example, that a guest cannot edit posts. It also filters out guest’s 
permission to access the dashboard or to update their own profile.

XLogin

Login to WordPress with external services like Facebook, Google, and Yahoo.

Marcus (aka @msykes)

Pixelite

Marcus

Meta Tags Manager is a powerful yet simple, lightweight plugin which allows you to add custom meta tags to your site. Features include:
<ul>
<li>Supports meta tags including the name, property, http-equiv, charset and itemprop attributes.</li>
<li>Choose from predefined types, such as ‘name=”keyword”‘ or create your own by typing it in.</li>
<li>Add meta tags to specific posts, choose what Custom Post Types to support from our settings page.</li>
<li>Add global meta tags that will display on specific CPTs, Taxonomies, your front page or your whole site.</li>
<li>Automatically add Open Graph details to your home page.</li>
<li>Automatically add Schema and Structured Data to your home page.</li>
<li>Add Google Sitelinks and Sitelinks Search markup.</li>
<li>Easily add verification codes for services like Facebook, Google Webmaster Tools, Bing Webmaster Tools, Yandex and more (or… create your own custom meta tags!).</li>
</ul>
Use cases include:
<ul>
<li>Adding Google and Yahoo site verification tags</li>
<li>Adding additional open graph, twitter card or other social media meta info not supported by other SEO/Meta plugins</li>
</ul>
<a href="https://metatagmanager.com/gopro/?utm_source=plugin-readme&utm_medium=plugin&utm_campaign=plugin" rel="nofollow ugc">Go Pro</a> for many newly added features, including:
<ul>
<li>Dynamic placeholders to include data about the page being displayed, such as page title, comment count, thumbnail URLs and more!</li>
<li>Additional contexts to add global meta tags, as well as exclusion rules for finer-grained controls.</li>
<li>Shortcode support within meta descriptions, allowing for more dynamic data insertion with plugins such as ACF</li>
<li>Unique tag detaction of Meta Tag Manager tags with hierarchical precedence, avoid creating duplicate meta tags.</li>
<li>Taxonomy support – create meta tags for individual taxonomy term pages such as a single tag or category.</li>
<li>More to come! Go Pro now and get an early-bird discount of up to 50%!</li>
</ul>

Meta Tag Manager

Easily add and manage custom meta tags to various parts of your site or on individual posts, such as Yahoo and Google verification tags.

XLogin vs Meta Tag Manager