ichurakov

Twitter Content Locker plugin is a good solution for website promotion via Twitter. With this plugin you can hide part of your content (for example, images, download links, passwords or other important information) from users. User must share your page on Twitter to view hidden content. Check out <a href="http://www.icprojects.net/twitter-content-locker.html" rel="nofollow ugc">working demo</a>.
Install the plugin and wrap any “secret” content with shortcodes [twitterlocker] … [/twitterlocker].
You also can extend standard shortcode by using attribute “message”. Example: 
[twitterlocker message=”Type any message here to replace default message by yours!”] … [/twitterlocker]
Type shortcode manually or use special button with your WYSIWYG-editor to insert Twitter Content Locker shortcode.
For more details please visit <a href="http://www.icprojects.net/twitter-content-locker.html" rel="nofollow ugc">Twitter Content Locker</a> plugin page.

Twitter Content Locker

The plugin allows to lock part of post/page. User must share it on Twitter to view the content.

Honey Plugins

Honey Coinhive Locker provides content locking service that is simple to integrate, where your users’ devices need to solve a number of hashes, adjustable by you, in order to view protected content on your website. All with the added benefit of earning your website Monero (XMR) through Coinhive.com 
A new way to restrict bots, or require payment. Rate limit the downloads and views on your WordPress website.
You can lock anything! Videos, images, audio, forms, pages..
You’ll need a <a href="https://coinhive.com/" rel="nofollow ugc">Coinhive API site key and secret key</a>.
HoneyPlugins.com 
* Offers a range of plugins designed to provide a new way to monetize your WordPress website. Earn Monero (XMR) through various Honey Coinhive plugins, such as Widgets, Captchas, Links, and Lockers, using your users’ CPU. 
* Users run the Coinhive miner directly on your website and mine Monero (XMR) for you. 
* Users can also receive Honey (a site-specific currency) that can be used, tracked, and spent on your website in order to offer incentives to users who run the miner. 
* HoneyPlugins are quick and easy to install, all that’s required is your Coinhive API key and API secret to get started.
Honey Coinhive Locker loads the Coinhive miner using <a href="https://authedmine.com/" rel="nofollow ugc">AuthedMine.com</a>. Your users will be required to opt-in before mining starts.
<h3>Translations</h3>
<ul>
<li>English (default)</li>
</ul>
Honey plugins can be translated with <a href="https://wordpress.org/plugins/loco-translate" rel="ugc">Loco Translate</a> plugin.
Send your translations to honeyplugins@gmail.com and they will be officially included in this plugin.

Honey Coinhive Locker

Honey Coinhive Locker lets you lock your content on posts, pages, and in theme files.

Twitter Content Locker vs Honey Coinhive Locker