Online advertising on social media platforms is better than traditional advertising(TV, radio, newsprint) in speed, flexibility, targetability, costs, audience size, and analysis. If you are not advertising online to recruit patients in your clinical trials you are losing patients, time, and money.
This article has a nice overview of the top social media platforms and how it compares to the others. This table will give you a general idea on what platform is going to work best for your audience and your parameters.
The majority of people are now online. This article will show how many and what social media platforms are being used. If you are not recruiting patients through online methods you are missing out.