Link from each page or only from homepage

[limens]

In addition to my main site (A), I also have another website (B) (question/answer) type, which has over 400,000 indexed pages in Google.

I'm trying to do linkbuilding for a.com:

1. should I link from B to A ?

2. should I place a link only on the homepage of B?

3. should I place a link on homepage of B and each of the 400,000 pages to A?

4. should place multiple links on B to A.com/subdirectories/

thank you.

[generalzod]

I'd recommend you steer clear of sitewide links from B to A. The majority of your duplicate links will be disregarded by search engines and they look like spam. Far better to put one link on the homepage of B and have 1 authority link instead of 400,000 discounted ones from PR0 pages (which I will assume most of them are?). Its always better to have links from diverse sources than many links from one source - even if its a notable one.

Good luck.

[EGOL]

I really like GeneralZ's answer....

Just tossing out another opinion....

Is site B related by topic to site A?  If not then the links will be worth very little.

Does site B have 400,000 pages of unique and substantive content?  If not then the links from that site will likely be worth very little.

Does site B have lots of links from outside of your network of sites?  If not then the links will be worth very little.

That is my technical analysis.

My opinion based upon a small number of observations is...  if you put 400,000 links from site B into site A the rankings of site A are likely to remain unchanged.

If my competitor said he was going to juice his site with 400,000 links from a Q and A site I would not be very worried.

[Dan-Petrovic]

I would like to add one point many people forget - disclosure. Google is pretty forgiving in terms of linking of own websites if the disclosure is clearly stated and it doesn't look like an SEOs attempt to manipulate link signals.

My suggestion is to link to your other site via a specific page on your first site and explain their relationship. This is a good practice in general, not just search engines.