German mobile social network Aka-Aki, which uses Bluetooth to do location-aware proximity networking and is also available in English, has raised a small investment of an undisclosed size from Creathor Ventures. The service started as a Berlin university diploma project but will, from August 15, have staff working full-time from an office in the city, Deutsche Startups says. This pretty mad explainer video is slightly confused but gets to the point in the end…