I've added a twitter feed with a CEWP on SP2010 which works fine there, but when I try to add it to SP2013 team site it's blank. What I've found on SP2013 is that if I'm in edit page mode I can see the twitter feed, but as soon as I save the page it disappears.
Also, if I go to http://sharepoint2013/sites/Home/_layouts/15/start.aspx#/ I can see it. If I go tohttp://sharepoint2013/sites/Home the twitter feed is blank again.
Another strange thing is when I open the CEWP in edit mode and hit the "Test link" button it shows the code that I saved in my text file instead of the twitter feed:
<a class="twitter-timeline" href="https://twitter.com/DisRightsTx" data-widget-id="327780816837017601">Tweets by @DisRightsTx</a>
<script>!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+"://platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs");</script>