Before there was Twitter, there was Facebook, and before that, Friendster. And who can forget MySpace? There’s a similar trend of successive usurping technologies in the fast-moving quest to develop therapeutics capable of modifying the genome. Since the late nineties, we’ve witnessed the rise of several gene-silencing approaches, from “antisense” oligonucleotides and RNA interference (RNAi) to the latest targeted genome-editing techniques, such as those based on zinc finger nucleases or CRISPR (Clustered Regularly Interspaced Short Palindromic Repeats) technology. These rapid developments raise the stakes for companies that have wagered on a particular gene-silencing approach.