Hello Jeremy,
Thanks for the response. I have tried exactly as per your instructions, but problem still exists and published article at our site is not getting twitted since June 11. Here is url of my site http://www.imtarticles.com/
Although there are lots of articles published at my site, even one I have published right now but no tweet for same at my twitter account.
Please let me know if any more information is needed to check the issue.
I think the problem is due to twitter api 1.1 which came into effect after June 11
Regards,
Rodney