Link campaign - new links ratio

How many new links per day are safe?

[angiolo]

Rumors say that organizing a link campaign, the number of new links per month should be less than 10 % of the overall number of links that the site has.

Is it right?
That 10 % refers to all the links ( outbound, inbound )?
Or does it refer to the unique links ( considering several links from the same site a s an unique link)?

My impression, in these days, is that it's not necessary a big number of links, but few good links per month.
I think that Google is implementing something like a "sandbox" for sites getting too many links in a short term.

[agerhart]

I think that is largely dependent on the level of authority your site commands, but even more dependent on the quality of those links.

If you have an established authoritative domain I don't believe there are negative implications with getting too many links too soon. There are many examples we can point to where a site can naturally gain thousands of links within a few days such as an exclusive news story breaking on a site that gets picked up by the media and blogs, or a new widget getting picked up thousands of customers.

With a newer site I might take a more conservative approach when building links...but the same concept applies.

How many links do you think Zillow.com acquired within the first few days it launched? Hundreds? Thousands? And it wasn't penalized.....