You can try the the_content filter, to append/prepend text to the post content.
Here’s a simple example:
add_filter( 'the_content', function( $content ) {
if( is_single() && has_tag( 'follow-me-on-twitter' ) )
{
$content .= '<div>Like my posts? Follow me on twitter!</div>';
}
return $content;
}, 99 );
where we append the extra text if the current single post has the follow-me-on-twitter tag.
Other ideas:
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You can do something similar for categories with the
has_category()function. -
You might consider adding an extra taxonomy to your posts, that’s not visible on your site, to handle the markings. Then you need
has_term()instead. -
You can use the post meta (custom fields) to mark each post. Maybe add a meta box with a select box.
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…