3. Formats. Only image hosting formats are supported.
4. Editor. The ability to edit photos directly on the site, as well as code generation for placement on html-pages, blogs and forums.
5. Search. You can search by tags, categories, topics. It is convenient.

6. Advertisement. How obtrusive it is. But here it must be remembered that without advertisements at all can only exist such giant services such as Mail.ru, Yandex, Rambler, Stream.
7. Services. Is it possible with this site to order photo prints, photo books, drawing pictures on shirts,  upload pictures ,mugs and so on? These services can bring to the creators of image hosting even more revenue than advertisement.