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Ahhh, I see what you're saying Adam.

I looked at the infographic page and the 2 links pointing to the homepage should send some PR to your homepage. So I doubt that's the issue.

One PR4 link isn't enough (even with the low OBLs of that page) is enough to bump a PR up from 2-3, at least in my experience.

It still may not be juuuuust not enough to show up on the toolbar. You could have literally gone from PR2.1 to PR2.9...almost there but not enough.

Just one thing about that you need to be careful about: having your 404 page indexed.

Some 404 pages have content (ie. "Sorry, but this page has moved...").

And if it's the only page on your site with that content, Google may still index the page.

MOST of your links should be internal pages...especially if you run a site with a lot of pages.

Take a blog with 150 posts. What are the odds that 90% of his links point to his (or her) homepage?

There's no hard and fast rule about what percentage of homepage vs. internal links you should have...but I try to have less than 50% of my links pointing to my homepage.

Simple answer to this: your homepage PR probably DID go up...but not enough to push it to PR3.

Remember that PR is semilogarithmic...each is not 10x the one before...it's often 1000+ times.

This means it takes a helluva lot more PR to go from 2 to 3 than it did to go from 1 to 2.

And keep in mind that there are hundreds of "partial PR" permutations not shown in the toolbar. So maybe when your homepage first showed PR2 it was PR2.2. And the PR4 link pushed it to PR2.8.

Not enough to show PR3 quite yet.

It depends on the way they're displayed, Jeff.

If the reviews are HTML, you bet your butt Googlebot can see them. If it's Java or Flash...that's another story.

Either way, that's not really the fresh content Google's looking for on page in my opinion.

When it comes to freshness, Google wants either a) significant amounts of content added to a site (ie. blog posts) or b) significant updates to existing content.

Either way, these reviews aren't likely to make much of a difference in terms of your rank.

Actually, domains that "no longer have a site up" don't have PR because they get deindexed.

If you're talking about buying expired domains, that's a viable strategy for getting a bit of a head start with a new site's SEO or building a blog network. But it takes a lot of work and a bit of cash.

One of the best places to find expired domains is at GoDaddy Auctions. Because the site's content recently dropped they usually hang onto their PR after you buy them.

You definitely want to be proactive...but not overreactive.

The disavow tool should only be used for a penalized site.

If you have a clean link profile you probably don't have to worry.

I once had a competitor hit me with 250,000 spammy blog comments...and nothing happened.

If you're really concerned you can always 404 the page and repost the content on another URL.