TELEGRAPH.CO.UK - Feb 8 - Investors have fallen out of love with Cupid.com after a BBC radio show started investigating the company as part of a programme about the online dating world. Cupid was forced to tell the stock market it was under scrutiny after shares crashed by as much as 13pc in morning trading. The radio programme will air on BBC Radio 5 Live on Sunday. Cupid would not disclose details of the investigation. However, it is thought to focus on the issue of scammers who set up fake profiles on dating sites, and ask whether online dating businesses do enough to protect their customers.