bulk_delete_tumblr_posts.rb

require 'rubygems'
require 'open-uri'
require 'mechanize'
require 'pp'

site_dashboard_url = 'http://www.tumblr.com/tumblelog/lstoll'
email = '[email protected]'
password = 'xxxxxx'

agent = WWW::Mechanize.new
agent.follow_meta_refresh = true
login = agent.get('http://www.tumblr.com/login')
page = login.form_with(:action => '/login') do |f|
  f.email = email
  f.password = password
end.click_button

page = agent.get(site_dashboard_url)

while form = page.form_with(:action => '/delete')
  puts "about to submit..."
  page = form.submit
end