Put on your hazmat suit and dive into a thread on r/t_d. You will notice that you will have to go almost to the bottom before finding anyone asking for a source to anything. The first reply will be some article that still doesn't provide any source. When an actual source is posted and that "ISIS refugee" pictured is actually anti-ISIS fighter as described by the Estonian reporter who took the photos, the facts are entirely ignored so that the sub can circle-jerk themselves about all of those radical islamic refugees that these dips have never met.
Exhibit 1: https://www.reddit.com/r/The_Donald/comments/5h68ua/estonian_reporter_recognizes_terrrorist_he/daxqmsv
ここには何もないようです