An online survey, the Understanding Emoji Survey, was conducted to assess how English-speaking social media users interpret the pragmatic functions of emoji in examples adapted from public Facebook comments, based on a modified version of [15]'s taxonomy of functions. Of the responses received (N = 519; 351 females, 120 males, 48 "other"; 354 under 30, 165 over 30, age range 18-70+), tone modification was the preferred interpretation overall, followed by virtual action, although interpretations varied significantly by emoji type. Female and male interpretations were generally similar, while "other" gender respondents differed significantly in dispreferring tone and preferring multiple functions. Respondents over 30 often did not understand the functions or interpreted the emoji literally, while younger users interpreted them in more conventionalized ways. Older males were most likely, and younger females were least likely, to not understand emoji functions and to find emoji confusing or annoying, consistent with previously reported gender and age differences in attitudes toward, and frequency of, emoji use.