Twitter widget has some compatibility issues issue with ASP.Net Ajax code.
To work around this issue:
Replace
<script src="http://widgets.twimg.com/j/2/widget.js"></script>
With
<script type="text/javascript">
var oldForEachFunction = Array.forEach, undefined;
Array.forEach = undefined;
</script>
<script src="http://widgets.twimg.com/j/2/widget.js"></script>
<script type="text/javascript">
Array.forEach = oldForEachFunction;
</script>
Article ID: 59, Created On: 6/3/2010, Modified: 6/8/2010