Which share icon is most appropriate for web?

1. Which share icon should I use?
2. What is the icon for sharing?

Which share icon should I use?

You should use the share icon depending on the platform for which you're building. If you are developing on Apple iOS 7, you should use the share icon that is already in use on that platform, the “Uploader.” Similarly, your Android app should use the “three dots.”

What is the icon for sharing?

The Hands – Open Share Icon

The Open Share icon conveys the act of sharing by visually representing one hand passing an object to another hand, as in 'pass it on' or 'sharing. ' The icon also represents an 'eye,' as in 'look at this. '