Pro Tip: give credit where credit's due
A h/t (hat/tip) or via when you reshare a post does three things:
1) Tells your audience that you care about etiquette and paying it forward
2) Generates a notification separate from the reshare*
3) Sends ProfileRank signals
In the attached article from +Lee Smallwood at +NOD3x you can see what I'm talking about for #3. This is really important as you look to build connections with influential people and their networks.