Unity is a volunteer project which aims to inform party-goers on the risks of drug & alcohol use. The volunteers themselves are often visitors of these parties as well, which helps the party-goers bond with the volunteers.

TheONE is a service which allows you to hire anyone on the site as an expert to give you advice, show you around cities, or give you their knowledge in many other ways for a customizable fee. Signing up is free, making it very easy to become a paid expert.

I love Spotify, I've even got a premium subscription because I'm addicted to creating very specific music playlists. Sometime last year however, they removed one of my favorite features; tracking new releases by artists you follow. Swarm.fm aims to bring this feature back in a grand way, connecting your Spotify account will show you all recent releases by artists you follow in an organised fashion.