| todayilearned | Today I Learned (TIL) | 40,058,567 |
| explainlikeimfive | Explain Like I'm Five | Don't Panic! | 23,121,617 |
| history | History | 18,625,867 |
| NoStupidQuestions | No such thing as stupid questions | 5,612,243 |
| YouShouldKnow | You Should Know | 5,460,920 |
| IWantToLearn | I Want To Learn: Connecting people who want to learn with people that can teach | 1,423,315 |
| Teachers | Teachers | 1,300,480 |
| geography | Geography | 977,534 |
| learnpython | Python Education | 909,901 |
| EngineeringStudents | EngineeringStudents: For those stuck doing math at 3am. | 859,590 |
| LearnJapanese | Learn Japanese | 740,628 |
| HomeworkHelp | When you just can't seem to find the right answer | 662,112 |
| DMAcademy | DMAcademy | 655,933 |
| Sat | /r/SAT! | 620,670 |
| studentsph | studentsph | 465,037 |
