announce.html

<section id="announcements">
  <h1>Announcements</h1>
  
  <article class="post"> ... </aticle>
  <article class="post"> ... </aticle>
  ...
  <article class="post"> ... </aticle>
</section>
<nav class="pagination">
  <a class="next" href="/page/2">Next</a>
</nav>

scroll.js

$('#announcements').infinitescroll({
  nextSelector: '.pagination a.next',
  navSelector: '.pagination',
  itemSelector: '.post'
});