When did the project "Photojournalists Want to Exhibit Their Best Works" go live?
project "Photojournalists Want to Exhibit Their Best Works" refers to title = 'Photojournalists Want to Exhibit Their Best Works'; when project go live refers to datePosted
SELECT T1.date_posted FROM projects AS T1 INNER JOIN essays AS T2 ON T1.projectid = T2.projectid WHERE T2.title LIKE 'Photojournalists Want to Exhibit Their Best Works'