Ekşi sözlük is not a dictionary to begin with. They just gave that name to it. It is purely personal commentary of the website authors and rarely you see factual explanations. It is a place for 'geyik'. In my opinion Ekşi sözlük could only be used as a learning tool once a learner has reached a certain level like C1. As a Turkish teacher and native speaker, I would call it an entertainment for the natives and alike. Hope this helps.

Dear italki you need very good chat console like msn.. Your system so good but chat is bad ! You must give money for development

Stay away from eksisozluk if you plan to use it for learning an explanation. Dont get me wrong. I like eksisozluk and I use it in daily basis however i do so, in order to read some funny comments on daily events. It s a funny website with funny explanations. I recommend www.zargan.com, as a helpful dictionary.

I am not very familiar with Urban Dictionary but i guess Ekşi Sözlük's format is very similar to that. But it is not always about having fun, sometimes you can find a very valuable and detailed information on a very spesific topic on ekşi sözlük. I beleive that ekşi sözlük would be very useful on learning turkish. By the way I am here to develop my english, please let me know if I did any gramatical mistake :)