Really new blog questions

I've read several posts about seo and posting your back links on blogs. My questions are:
1. Do you allow the host site access to your friends list in order to log on with facebook?
(In order to reply to a post you have to eaither create an account or log on with FB, hence, access to your friends list)
2. Most sites I've seen don't allow posting URLs, how do you get around that?
3. Most sites require creating an account, do you really have to do that (to create 100's of accounts just to be able to post on each one)? or is there a way around that?

I am not experienced with this... Hope you would get best answers related to your question...

Never Give Up

Good Luck!

You are asking about blogcommenting
1. If that blog requires FB login to comment. I use my fake FB account to do. Few sites requires registration through FB,
i use the same fake FB account for that. I use unique fake FB, G+, Twitter accounts for every SEO campaign i use.
2. Skpi those sites who don't support posting URL's and anchor texts.
3. Yes you need to create account on each blog/forum/site if it aske you to do. There are softwares around like SEnuke, GSA
search ingine ranker, Scrapebox, etc., which do this job. You need to spend $$$ and it requires different proxies and VPS.
If you have good budget you can get those. But i prefer doing manually.

when you are in promoting your blog, be sure to use your commercial account and not your personal account to avoid future problem in spamming issues