For example, Crew, a company who matches companies with hand-picked freelancers, offers a number of different side projects to their customers, including things like a calculator to help people figure out the cost of an app they want develop, a collection of free stock photos, and a list of what they call ‘unicorn’ coffee shops to work from that have the ultimate combination of working perfection: good coffee, good wifi, and plenty of outlet plugs.
Some ad platforms will ask more of your landing pages than others, when running ads. For example, AdWords is much stricter, when compared to Facebook. AdWords typically requires that you do not have a ‘thin,’ site that is designed solely to collect leads. Because of this it might be a good idea to focus on using Facebook or Twitter, to begin with.