I want to put a few social media "share this" buttons on a website.
Are these pretty safe to use, or will they allow all sorts of spammy ads to infect the site?

Has anyone used them from this site?
https://www.addthis.com/get/sharing

The site owner doesn't care about tracking, so free is OK as long as they don't bring in unwanted ads.
Recommendations appreciated!

I've used Po.st http://www.po.st/#Q339cseZCKXtRBMb.97

Thanks, G. I'll have a look.

I use http://www.addthis.com/ on a lot on my sites.