Crowdsourcing spatial data with online clickable map?

definitely it is an use case for the excellent Crowdmap web application (based on Ushahidi) here.

Try out http://opendata.socrata.com/. You can create a dataset that includes columns for some data and location columns. There is a Visualize tool that lets you visualize this data on a map, and there's also an Embed tool that lets you create a form that the public can use to submit new data.

Here's an example: http://opendata.socrata.com/Business/Seattle-Startup-Map/nhx8-7ic6. If you click on More Views, you can see how the owner of that dataset has created a form that can be embedded or shared elsewhere to allow new data to be submitted.

Full disclosure: I used to work at this company, but no longer do.