This 50-minute presentation introduces r/SampleSize, a community on the website Reddit that allows for online participant recruitment without compulsory or immediate payment. It will provide an overview of best practices for recruiting participants on r/SampleSize. It will also compare r/SampleSize to Amazon Mechanical Turk (MTurk), a widely used crowdsourcing platform for recruiting research participants. Learning ObjectivesAt the conclusion of this webinar you will be able to: Describe best practices for recruiting research participants on r/SampleSizeList key advantages and disadvantages of r/SampleSize compared to MTurk and other participant pools Identify key limitations of r/SampleSize and MTurkAll webinars will be accessible afterward on the <a href="http://sc-ctsi.org/digital-scholar/" target="_blank" rel="noreferrer noopener">Digital Scholar Program page</a>.SpeakerRaymond Luong, PhD Student in the Experimental Psychology Program at McGill University. Specializes in Quantitative Psychology and Modelling