Opponents of Citigroup’s pickup of Associates First Capital have started a web site. The site, www.tellcitibank.org, will track the lending activities of Citigroup and its subsidiaries, provide information on predatory lending and give activists, customers and shareholders an avenue to send messages to the company. Included among its content are fill-in-the-blank emails that include a list of recommended reforms such as a 3 percent cap on loan fees and a ban on prepayment penalties.