It depends of the quality of the links. But if you're asking about SERP impact, I must say they have effects especially if their on the same niche. But don't just interlinks each other too much because you might get banned in Yahoo,(yahoo is strict on this links scheme) who knows maybe also in Google as well.
I was thinking about links from different myspace profiles or wordpress blogs. How much effect do 10 links from different wordpress blogs have in comparison with only 1 link from one blog?? Same for myspace accouts.
Links from pages with a high PR, will help the most. Not every page on a high-traffic site will have a high PR.
just know that it wont hurt you - it will give you more backlinks, its probably a sitewide links and it wont hurt you in anyway, it can only help both serp and pr
Site wide links are actually pretty helpful even now. So multiple links from the same domain is a good thing, though it'd be much better if each of those links was from unique sites - everything else (PR/traffic) being equal.
OK. I know every link is helpful, but is it worth taking time and developing 10+ blogs on wordpress with PR4+ to link from them?
You should try to get links from related sites and also check the page rank of the site you are placing your link, it is also considered very important. Quality of links always have more weight than quantity of links. articles-heaven.com
Links from different blogs, definitely useful. The subdomains are considered as individual domains themself ~G
Try to spread your links across relevant domains - this will give your webpage the highest link strength.
A subdomain has no difference then a plain .com/net/org/info This forum is run on a subdomain, so you would knock back a link on the forums main page and say it's not much value?
Links from many popular blog sites use the rel=nofollow so although there is a link there the PR probably won't carry. SERPs are especially familiar with the blog link approach to SEO and Google in particular. If you are using blog links then make sure the content is fresh (a tall order on the web nowadays).
Check your stats you all have some links from DP and what i know is that each signature is counted as a single link