Each account set up has facebook/disqus etc attached to it and a designated email. I only have around 6-8 personas so it's not confusing. If someone replies to a comment, I get an email alert so that keeps tabs on any 'hot' links.
Obv G will tell you in the results if you've already visited a page, which avoids any duplication.
Up until a few weeks ago I was doing the same as you, using buzzbundle then manually searching G, but what I found was it was just quicker to do manual searches rather than both, as G gets you every result that BB does and more.
There is another advantage to using G instead of Buzzbundle - Buzzbundle is popular. Try searching for "weight loss" in facebook threads on buzzbundle, and any fan page post which shows up will have 3 or 4 other affiliate links from people doing the same thing as you are within an hour.
Since Buzzbundle doesn't pick up half of what you will find with a manual search, there will be tons of threads which have not been spammed by buzzbundle users in the search results.
I do agree though, with multiple accounts, multiple sites and multiple campaigns, buzzbundle will make the process a little less painless and less confusing.
Doesn't really need to, as buzzbundle does things chronologically with the latest result at the top.