The leaving parties are coming thick and fast now at Yahoo. Just days after the company appointed a new marketing director, news is emerging of two more departures from Yahoo (NSDQ: YHOO) UK’s sales team: Stephen Haines, head of agency strategy for Yahoo! UK and Ireland, and group head Jon Harvey. Media Week writes that they are planning to join former commercial director Blake Chandlee at Facebook, where he is building a new team to spearhead the social net’s commercial strategy in the UK.