score:1

Accepted answer
return (
     <span>
        :&nbsp; 
        <a href={'http://www.twitter.com/' + twitter}>
           Twitter
        </a>
     </span>
)

score:1

    render: function() {
       return (
          <div>
              {this.props.name} : 
              {this.props.twitter?<span>:<a href={'http://www.twitter.com/' + twitter}>Twitter</a></span>:null}
          </div>
       )
    },

score:2

{twitter && (/*something to render*/)}

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