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A few months ago I would have said no way, but lately I've been reading about group demotions...like all the sites listed in one Webmaster central account, so who knows. I would not risk it.
Time to burn this domain and get a new one? Might be a consideration if you can't remove most of the maginal to definately spammy back links.
For what it's worth, one of my sites had a -50 filter/penalty and I moved it, together with all my other sites onto a dedicated hosting package. All the sites are also on the same Webmaster Central account. Its been six months now and none of the other sites were affected. Incidentally, the site in question recently recovered from its penalty.
IMHO patience is still the byword here. My site had the -50 thing for three years. Don't despair!
Can you share anything you did to make the recovery happen?
You may want to rethink the -50 penalty for same IP, I have seen no negative effect from this at all.
It seemed to be a backlink profile problem. I thought that, because my site is an exact match domain, that building links to the site name wouldn't be a problem. Mistake. When I suspected this might be the problem, I started link building again and managed to acquire around 30 new links with mixed up anchor text - it seemed to do the trick.
I assume that it was a backlink problem because I hadn't touched my site for about a year beforehand. I had kind of given up on it.
Did you ever submit a reconsideration request? If yes, then what was the reply from Google?
JC Penny backlink penalty was removed after 3 months and they built a crap load of links and thousands of them. Did you make that many links? IMO, Back linking penalty doesn't last for two years unless you are linking out to bad sites. Just my thoughts.
but lately I've been reading about group demotions...like all the sites listed in one Webmaster central account
...Google wants to know what you've done to fix issues, such as bad links, since I could not do that I just left it alone.
Wondering out loud here...
In a case where you built many spammy backlinks to INTERNAL pages, whether 401 those pages would help your case.
I know that wouldn't help in the case of spammy links to the index page, since probably no one would ever 401 their home page.
And I know that you could remove those 401s once the penalty was lifted.
But still, in a case where you couldn't remove bad backlinks, I wonder if that would help at all?