Twitter advertising network Ad.ly, which launched last year, has raised $5 million in additional funding led by GRP Partners with Greycroft Partners and Matt Coffin (the founder of LowerMyBills) participating in the round. Ad.ly is also bringing on new CEO, Arnie Gullov-Singh. Gullov-Singh was previously EVP of product, technology and operations at News Corp's Fox Audience Network, a group he co-founded 4 years ago.