onepointone - 8:01 pm on Jun 27, 2010 (gmt 0)
I added one of those 'bookmarking widgets' to a well-performing blog about a year ago and the rankings tanked about a week later. Took it off and the rankings came back in about the same time.
After checking, later, I can't believe how much It had increased the page code, load, & (bloat).
[to be fair, I don't remember for sure if it was addthis or some other companies code I added.]