One great example I have seen are websites that prompt you to sign up only after you have already engaged with the site e.g. on some sites, you can initiate an

One great example I have seen are websites that prompt you to sign up only after you have already engaged with the site e.g. on some sites, you can initiate an action but to complete it, you need to create an account. This has the double benefit of enabling users to try out the functionality of the site without the commitment of signing up and also harnesses the momentum of the users engagement to get them over the hump of completing the sign up process.