It's fairly clear in most cases, except Facebook's usage. It took me forever to figure out what was going on in Facebook's app.
The much worse icon-fail imho is the "share" concept.
http://cl.ly/2j1a40461E1B2U0X2W2q <-- Apple's version is ok, but doesn't seem like "share" and there are many much worse.
The much worse icon-fail imho is the "share" concept. http://cl.ly/2j1a40461E1B2U0X2W2q <-- Apple's version is ok, but doesn't seem like "share" and there are many much worse.