Java scripts are not displaying on posts

Hey Guyz,

I just tried to add below code into my wordpress site, under one of the pages (about us).

<a href="https://twitter.com/user" class="twitter-follow-button" data-show-count="false">Follow @user</a>
<script src="//platform.twitter.com/widgets.js" type="text/javascript"></script>

but it’s just displaying as a hyperlink.. can anyone advise me how can I fix it 😉

thanks in advance.