Service
RSS follow buttons
Link visitors to your RSS profile. This service supports following, rather than posting a shared web link.
Website button
<div class="ats_follow ats_kit_size_32"> <a class="ats_btn_rss" data-handle="https://example.com/feed.xml"></a> </div> <script async src="//static.addtosite.com/widget.js"></script>
Other services
The same button, built for somewhere else. All 79 are in the directory.