Google adwords for a news aggregator kind of product is mostly going to go in vain. Advertising on relevant blog would get you a better reach. Beyond that a w

Google adwords for a news aggregator kind of product is mostly going to go in vain. Advertising on relevant blog would get you a better reach. Beyond that a well chalked out email marketing and as others mentioned heavy social media penetration would work for this. Additionally adding some kind of a virality into your product to increase word of mouth, some interesting ways where people would find it useful or intuitive to forward it to friend would work. Finally, a very aggressive seeding from your own team - send it to all friends, repeatedly request them (if they would and if no, why not) send it to their first circle.