I've been reading these forums for a long while, however just signed up recently so forgive me for asking for help on my first post however I am really frustrated with something that is going on. Basically about a month ago my friend and I purchased an exact match domain which has been online since 2005 and began re-designing and revamping the site. About two weeks ago, I noticed the site started to show up on page 2 in Google for the target keyword which is normal for aged exact match domains even for a competitive phrase. Everything was going well and then about a week ago we vanished from the SERPS only for that specific keyword. The site is still indexed and ranks for some other long tail keywords which leads me to believe it is some sort of single word filter or penalty which has been triggered. We went from being on page 2 to not even being in the top 1,000 results for this keyword so I don't believe this to be some sort of "normal" fluctuation for the site. All that I've done to date is revamp the site, add new content and exchange links with roughly a dozen related sites, making sure to vary anchor text across the exchanges. Nothing shady has been done, however I was using some different ranking tools on SEO sites to check SERP positions, etc so not sure if this had something to do with it. Does anyone have any advice as to why this may have happened? I tried asking for help through the webmaster forums on Google, but no one seems to know why something like this may have happened. I guess the only thing I can do is play the waiting game but it's extremely frustrating to have this happen when I don't think we've done anything to deserve it. Anyways I would appreciate any input anyone can give and thank you.