In today’s funding and acquisitions round up, the last of 2015, Buffer has acquired Respondly, Yahoo Japan has launched a bid to buy travel website Ikyu for $828 million, Digital Guardian has raised $66 million, and Indian home services startup Housejoy has raised $23 million in a round led by Amazon. Closer to home, VentureCrowd closed a $2 million round, while ERM Power acquired sustainability monitoring software provider Greensense.