Looks useful as I'm just getting into that sort of stuff for my business [0] I experimented with two ad campaigns, on Facebook and on Reddit, both the cheapest options. Had some weird results from the FB one: most of the "reached" users were concentrated in Eastern Europe, even though my locations were set to the US, Canada and Europe. All in all, it didn't yield many clicks but for ~£10 I wasn't expecting much. Redd…
I haven't signed up myself, but how are you planning on solving the chicken/egg marketplace problem?