Ivailo from retaggr here. Thanks for checking out retaggr, I am glad you like it.
I just wanted to let you know that, you can embed the actual card on your blog rather than a screen shot of it, if you click on the "Get this / Embed" link on the bottom right corner of the card (next to the logo) an then select Embed code for full profile card. Copy and past the code into your blog and it will be all done.
That way people can interact with your card without leaving your blog.