Many emoji sets have a Creative Commons license that requires attribution, and while I think I know what to write in the attribution, I don't know where I am required to place it. Quoting some info I read on the CC's website:
...attribution can be implemented in any "reasonable" manner...
...you may satisfy the attribution requirement by providing a link to a place where the attribution information may be found...
Can I insist on the exact placement of the attribution credit? Answer: No. CC licenses allow for flexibility in the way credit is provided depending on the medium, means, and context in which a licensee is redistributing licensed material.
Now quoting from the websites of Emojione and Emojitwo (two popular emoji sets, licensed under CC):
Attribution location: a note with link on every web page where our emojis are displayed is required.
Attribution location: in the footer of every page where emoji are shown.
Suppose I'd like to use those emojis in an online community, am I really required to put a complete attribution note on every page? I thought I could write the attribution note on only one page, maybe the "about" page, or a dedicated page where the credits are found. Maybe a good compromise could be to put the attribution in a "credits" page, and put a link to that credits page in the footer.