app/views/users/_user.html.erb
<li class=user-box>
<%= gravatar_for user, size: 50 %>
<%= link_to user.name, user %>
<% if current_user.admin? %>
<% if !current_user?(user) %>
| <%= link_to "delete", user, method: :delete,
data: { confirm: "You sure?" } %>
<% end %>
<br/>
<span class=text-muted><%= user.email %></span><br/>
<span class=text-muted><%= time_ago_in_words user.created_at %>.</span>
<% end %>
</li>