Welcome to the Q&A Forum

Seriously, Ryan is always ALL OVER Seomoz comments with good feedback

We currently use Sharethis, but I've noticed many sites using Addthis for sharing. Is there any preference or reason to use one more than the other?

I'd like to add live chat ability to one of my sites. The last time I did this, I used the largest provider and was disappointed at the way the addon tended to drag page loads, but this was also three years ago.

Any experience or feedback about the live chat systems out there?