Twitter was shut down officially in Turkey. If you`re interested to used Twitter without access to the website or applications, these tips will help you.
First, Twitter provide access via SMS:
If you are in Turkey, you can send tweets using SMS. Avea and Vodafone text START to 2444. Turkcell text START to 2555.
1. Change your DNS to 220.127.116.11 http://en.wikipedia.org/wiki/Google_Public_DNS
2. Download Hola, it is free https://hola.org/
3. Install Zenmate to Chrome https://zenmate.io/home
4. Use a free VPN solution http://www.hotspotshield.com/
5. You can use Twitter with SMS http://support.twitter.com/groups/54-mobile-apps/topics/225-sms/articles/14014-twitter-via-sms-faqs