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Not a fun process - but I have done migrations like this in the past.

From what platform to the next is it?

Example: PHP to wordpress or wordpress to wordpress kind of move?

• I had did a php to .html (wordpress platform) - using canonical link methods as well - and the migration/indexing went flawless.

Would like to see if I can help ;o)

Your pal

Chenzo

In my experience with multiple domains forwarding to 1 mothership - I have seen issues with rankings and overall organic nature of all sites.

It would be best to at least place a few pages, >5 on the sister sites with authentic content - referencing the mothership with jpeg logos etc - to eliminate an un-healthy back link profile.

Your pal,

Chenzo

Alan, it is an out-dated mind set.

It is good to supply external links to authoritative social portals belonging to the web portal.

/Chenzo