is there a way to share my add ons with others , specifically friends in here?

You can just post a link to what addons that you use.

can i post it in a blog ?

I don't work for Curse.com but I think as long as you keep in mind that the blog can be seen by anyone and write it appropriately you will be fine. You could make it a "here is a great set of addons and why" blog post.

If you have any knowledge about websites and have the webspace you can use UniAdmin with UniUploader. Which is a part of WoWRoster.