Hi to everyone! I always try to change the links and have about 40 external links from low PR sites. Are Links from low PR sites useful?
Its useful for improving ur site's SERP, 'll not have a great move in PR. For more details check this url -> http://en.wikipedia.org/wiki/PageRank . You can get the complete idea about the PR calculation has done by G.
do not forget if you get a site at a low PR it might overtime rise in PR and the link is more valuable don't discount a link just because of low PR
Ya definately they are useful ... PR tend to increase with time and sooner or later the low PR will get high PR ...