How about battery powered quadcopters with camera feeds and remote control? The Parrot AR.Drone was introduced in 2010, the first (AFAICT) consumer-priced drone to offer this kind of functionality. It was just a toy. Today similar low cost drones are used in film and TV production, wind turbine blade inspection, mapping, surveying... Consumer drones have even been weaponized by ISIS with small droppable grenades. Not that the latter is exactly a positive development, but it's not a toy use either.
One example: Bitcoin (2009, but few had heard of it before 2010), cryptocurrencies and blockchains. I think these support cdixon's claim.
Another: Snapchat (2011) and other ephemeral messaging apps. These certainly seemed like toys.