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1 of our sites, "example.org" vanished from Google on June 4, running out of options what else can be done to recover lost traffic (well, not totally vanished, just lost about 80% traffic).
We also own "example.com" which we never used for content. All the content and inlinks are located on .org site.
Would you still ride this thing out or do such a drastic move? Would google treat the new .com as a brand new site?
We pretty much "cleaned up" everything we could. We found some links in our forum to .jp, .cn or .ru "dirty" sites. Some people got creative and it slipped through our system. Maybe it would be a good idea to ban googlebot from our forum section (the only section we have no control over content, or at least we have to monitor extensively)
Just frustrated how much longer this will take, site is over 5 years old and this is 1st time in 5 years we got hit.
If site A (example.org) looses ranking, and we open Site B (example.com) would the penalty or filter or whatever this thing is end up in Site B?
I can't say for sure, but if you follow the protocol and what is supposed to happen in this type of transfer, then yes, there may be some challenges moving to the .com TLD. You will most likely use a 301 to redirect old to new and that is where the challenges come in. The 301 permanently transfers whatever was at the hold to the new. So, if there are penalties/filters at play on the old domain, there is a good chance they will transfer to the new domain.
Dropped the forum from the site, everything came back stronger. Assuming the forum is the problem for you: not sure if this can now be accomplished with a robots.txt exclusion seeing as how googlebot already knows its there.
Using the 'unclean' old domain will be pointless; a 301 from an unclean domain to a new one is worse than pointless.
You need to deal with the old problem first, then see what state the site is in.
It would be a shame to lose a successful forum from the serps; would it be possible to lose signatures and introduce nofollow (or ban HTML content?). Or simply to tighten up the moderation?
While a forum - or other third-party content - has to be prime suspect, other links may have gone bad, or be part of link exchanges.
Site-wide links to old SEOs and designers can be disastrous, and any link exchanges ... I'm sure you've checked out all these things, but with Google, a serious penalty is almost certainly link related - unless you've revived pre-2002 SEO techniques ;)
Good Luck with the reinclusion request. :)