Self-serve advertiser signup

[davidfischer]

Advertisers should be able to launch an entire ad campaign without having to talk to anyone. This is critical to let advertisers try the platform with a low commitment to see if it works for them. This will probably involve a wizard of some sort to guide a new advertiser through the platform and create all the things they need to do:

• Setting up ads Advertiser ad management interface #87
• Handling billing Managing advertiser billing #88
• Setting up targeting Managing ad flight targeting #89
• This will open up our signup infrastructure (or possibly advertisers will need an approval) and so that workflow needs to be optimized.

This will let us lower the barriers to entry to start advertising on our platform. Instead of having minimums in the hundreds of dollars, advertisers will be able to try out advertising for tens of dollars which is much more manageable.