LONDON (Reuters) - Unruly, one of London's hottest tech companies, has made its first acquisition, buying Germany's Shareifyoulike to gain the leading position in viral video marketing in the country. Unruly and Shareifyoulike work with advertisers and their agencies to create viral campaigns, whereby ads are viewed, shared and talked about on social networks, creating millions of pounds worth of marketing for brand owners. "Germany is a key market for us, it's the largest advertising economy in Europe," Unruly co-founder Sarah Wood told Reuters in an interview. ...