Google suggests +1’ing as shorthand for “this is pretty cool” or “you should check this out.” So my question to you: are you liberal or stingy with your +1’s? Do you make each and everyone count, as if it was a personal recommendation or endorsement? Or do you litter the web with +1’s for anything better than average?
Before you answer: here is one final consideration. You can view all your +1’s in your profile. Someday, google may allow you to make this entire list public. Do you want this to be a curated list or a laundry list?