# Can I put tooltips in a Graph?

This doesn't work:

Is there a way to do this? My real goal is to identify the second links in the graph below, which shows the results of a webcrawl (using this code). I'm open to another approach.

Graph[{1, 2, Tooltip[3, "Label"]},

You can also explicitly label using VertexLabels and use Tooltip as the positioning:
Graph[{1 -> 2, 1 -> 3, 1 -> 4, 1 -> 5},