Can I Ask Salary Range Before I Apply?

Dear Experts, Is it appropriate to email a job poster to ask what the salary range is for a posted job? I don't want to waste my time applying and interviewing if the salary's too low. Our Twitter Advice Project (T.A.P.) is no longer an active campaign. To find an answer to the above question, please use the "Search" box in the right-hand column of this website.