There are many ways of obtaining free backlinks, and you will find a lot of information about them on this forum. Blog commenting, guest blogging, press releases and social bookmarking are all good ways to get started.

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I think you should do some social bookmarking first. Then try to build link using do-follow forums.

Here is a list of web 2.0's for building backlinks a found on warrior awhile back can't remember thread had them saved

wordpress.com - pr9
tumblr.com - pr8
typepad.com - pr8
weebly.com - pr8
blogger.com - pr8
tripod.com - pr8
posterous.com - pr7
jimdo.com - pr7
yola.com - pr7
squidoo.com - pr7
multiply.com - pr7
angelfire.com - pr7
officelive.com - pr7
rediff.com - pr7
wikidot.com - pr7
webs.com - pr7
webnode.com - pr7
salon.com - pr7
edublogs.org - pr6
webspawner.com - pr6
soup.io - pr6
ucoz.com - pr6
travelblog.org - pr6
gather.com - pr6
springnote.com - pr6
webstarts.com - pr6
moonfruit.com - pr6
journalspace.com - pr6
blog.de - pr6
onsugar.com - pr6
quizilla.teennick.com - pr6
areavoices.com - pr6
freeblog.hu - pr6
blog.com - pr6
blogdrive.com - pr5
blogtext.org - pr5
freeflux.net - pr5
freehostia.com - pr5
zoomshare.com - pr5
flixya.com - pr5
webgarden.com - pr5
ohlog.com - pr5
livelogcity.com - pr5
snappages.com - pr5
sosblogs.com - pr5
visualsociety.com - pr5
insanejournal.com - pr5
alivenotdead.com - pr5
hazblog.com - pr5
hpage.com - pr5
blog.com.es - pr5
350.com - pr5
beep.com - pr5
devhub.com - pr5
blog.hr - pr5
blinkweb.com - pr5
ewebsite.com - pr5
flukiest.com - pr4
bloggum.com - pr4
inube.com - pr4
iseekblog.com - pr4
hipero.com - pr4
blurty.com - pr4
bloghi.com - pr4
wallinside.com - pr4
getjealous.com - pr4
fotopages.com - pr4
wikipages.com - pr4
freeblogspot.org - pr4
myblogsite.com - pr4
spi-blog.com - pr4
2itb.com - pr4
mytripjournal.com - pr4
blogreaction.com - pr4
doomby.com - pr4
blogge.rs - pr4
mywapblog.com - pr4
yousaytoo.com - pr4
publr.com - pr3
blogster.com - pr3
weblogplaza.com - pr3
spyuser.com - pr3
bcz.com - pr3
iblog.at - pr3
honmag.com - pr3
blogpico.com - pr2
evood.com - pr2
uwcblog.com - pr2

There is many link building variations I would recommend web 2.0 with unique not spun content and social signal's to boost the ranking power...

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You can get back links submitting your links in quality websites and back links can be obtained by using processes like Directory Submission, Social Book Marking, Blog Commenting, Guest blogging, article submission, press release.

The competitor links are more powerful and can be higher rated on site ranking. One needs to understand about page rank and alexa rank to calculate the power of back links

You need to built high pr and do follow back links for getting better result,,,,,,

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There are many ways to obtaining backlinks. As of i know if your website is new you can start social bookmarking first because you can get more visitors from social media sites. After that lightly start with web 2.0,Guest posting, Blog commenting,Forum posting.