title: Implementing twitter-like hashtag on rails
body: <p>I'm want to implement twitter-like hashtag on my app.</p>
  
  <p>Let's say I have user input to a text area "I'm coming to #london from #paris" then I want to build tag cloud of the hashtags.</p>
  
  <p>I'm thinking of using acts-as-taggable-on. So I find all of my hashtags from the text in the backend, then save it to tag field.</p>
  
  <p>Anyone has experience on this they would like to share? Thanks.</p>