Show list of subscribed entries via Comment add-on and Stash for logged in users in ExpressionEngine.

Entry Subscriptions

{exp:stash:set_list name="author-comments" parse_tags="yes" parse_depth="2" refresh="6" save="yes" scope="site" replace="no"}

	{exp:comment:entries sort="asc" limit="500" dynamic="no" author_id="{member_id}"}
		{stash:comment-title}{title}{/stash:comment-title}
		{stash:comment-entry_id}{entry_id}{/stash:comment-entry_id}
	{/exp:comment:entries}

{/exp:stash:set_list}

<ul>
	{exp:stash:get_list name="author-comments" unique="yes" parse_tags="yes" parse_conditionals="yes" orderby="comment-title"}
	<li>
	<h4>{comment-title}</h4>

	{exp:comment:notification_links entry_id="{comment-entry_id}"}
		{if subscribed}
			<a href="{unsubscribe_link}" class="btn btn-xs btn-primary">UnFollow</a>
		{if:else}
			<a href="{subscribe_link}" class="btn btn-xs btn-viewmore">Follow</a>
		{/if}
	{/exp:comment:notification_links}
	</li>
	{/exp:stash:get_list} 
</ul>