Caterpillar and Volvo Construction Equipment have exited online machinery auction platform IronPlanet through an acquisition by Ritchie Bros Auctioneers.

Stanford-backed edtech Duck Duck Moose has been acquired by Khan Academy for the symbolic sum of $1.

TripAdvisor has paid an undisclosed amount to acquire social mapping platform Citymaps, which received funding from Nokia Growth Partners in early 2015.

The Scripps Network-backed online furnishings flash sales company, once worth more than $900m, was reportedly purchased by Bed Bath & Beyond in June for less than $30m.

FullContact has acquired Profoundis, a graduate of Microsoft Accelerator, for an undisclosed sum in a move to defend itself against soon-to-be Microsoft-owned LinkedIn.

Vurb, a contextualised search app that had raised $10m from backers including Stanford University, is set to be acquired by Snapchat in a 75-25 stock-cash deal.

The internet services provider has paid an undisclosed sum to buy MassiveImpact, a mobile advertising company backed by SoftBank, SingTel and Cloudian.

Rakuten, which had previously taken part in a $14.5m series A round for payment platform Bitnet, has acquired the company for an undisclosed sum.

The courier firm has acquired a majority stake in Snapdeal-backed courier service GoJavas for an undisclosed sum.

Game livestreaming platform Twitch has bought gamer community, video and information company Curse, which received $30m in funding from Riot Games last year.