David Kimura I just figured out the problem.

I was trying to render the tueets like this:

<% if @tueets.empty? %>
  <span>No tweets!</span>
<% else %>
  <div id="tueets">	
    <%= render @tueets %>
  </div>
<% end %>

Well, it seems that if I put the tueets div inside a logical condition, the partial doesn't get updated properly until that condition gets resolved. I removed that if statement and the page is updating as it should.

Thank you anyway!