Online surveys can be a very useful tool, however, they are often incorrectly suggested in place of in person research. Online surveys will never replace the insights or value of active conversation with users and shouldn't be seen as a replacement for user interviews or sales calls. Online surveys are best used when your venture is looking to collect specific information from a large number of users. Surveys should be short and easy and, hopefully, will provide a recruiting opportunity for future research or testing. Connecting your survey to an online ad campaign can help to increase the number of users and also increase the amount of quantitative data collected.
Survey builders like Google Surveys, Typeform or Survey Monkey not only have tools to create surveys but also the means to collect and measure results.