has acquired social bookmarking service Clipboard in a deal valued between US$10m and US$20m.

The Washington-based start-up previously raised about US$2.5m in seed funding from Andreessen Horowitz, Index Ventures, CrunchFund, SV Angel and Betaworks, and has now signed an acquisition deal worth up to US$20m, reports AllThingsD.

Clipboard CEO Dr Gary Flake will take up the role of vice-president of engineering at and the start-up’s core engineering and design team will be joining him in’s Seattle, Washington, office.

Clipboard will be shuttered on 30 June as the team focuses on integrating its functionality into products.  Users can access their clips and boards from a personal archive or they can wait for their data to be deleted forever one week after shut-down.